Really Hard Math Problems!

[Mrdemolisher]

Read the title, everyone...
Make them too hard to be done with a calculator.
And figure out the answer before you post the problem!
This could also be math trivia having to do with anything related to math you want. Including geometry!
I want to see what problems you guys can come up with, but I'll give you a relatively easy one to start with.

10 x 10 x 10 x 10 x 10 x 10 x 10 x 100 x 1000 x 100 x 10 =
Well?

[secretwepon]

10 x 10 x 10 x 10 x 10 x 10 x 10 x 100 x 1000 x 100 x 10=100,000,000,000,000

There Easy

[Mrdemolisher]

Incorrect, secretwepon! You can either try again or wait for someone else to try.

[Iavgotregigias6]

1,000,001,000

[PikaComet]

How about 10 x 10 x 10 x 10 x 10 x 10 x 10 x 100 x 1000 x 100 x 10=12,000,000,000,000,000

[Mrdemolisher]

Still incorrect...
Hint, everyone: Secretwepon wasn't too far off.
He was only a digit away from getting it right...
Secretwepon, Iavgotregigias6, and PikaComet have all gotten it wrong.
But you guys can try again if you want!
If we get to page 2 on this thread and no one has gotten it right, I will tell you the answer.

[PikaComet]

I'll try again.I know its right this time:10 x 10 x 10 x 10 x 10 x 10 x 10 x 100 x 1000 x 100 x 10=1,000,000,000,000,000

[secretwepon]

10 x 10 x 10 x 10 x 10 x 10 x 10 x 100 x 1000 x 100 x 10=10,000,000,000,000,000

[Iavgotregigias6]

10,000,000,000,000

[PikaComet]

i think that's wrong.Am i right?

[Mrdemolisher]

PikaComet is CORRECT!!!!!!
Congratulations!
Now make your own hard math problem, PikaComet!
The answer, yes, was 1,000,000,000,000,000. In other words, one quadrillion.

[PikaComet]

Mine is not all multiplying.



22 x 46 + 24 - 10 + 70 x 10 =?

Take your time.



Sincerly,
PikaComet
A Future VIP.
http://forum.cheatmasters.com/images/ranks/vip-member.gif

[Mrdemolisher]

Well, if you follow the Order of Operations, then it's 1,726.
But if you just do the whole thing in order, it's 10,960.
Is either one the answer you got?

[Iavgotregigias6]

whats 48dividedby 7


no divided by signs

[PikaComet]

Well, if you follow the Order of Operations, then it's 1,726.
But if you just do the whole thing in order, it's 10,960.
Is either one the answer you got?


the second one was correct.
Sincerly,
PikaComet
A Future VIP.
http://forum.cheatmasters.com/images/ranks/vip-member.gif

[Mrdemolisher]

Iavgotregigias6, it's 6.857142857.
That's what I got, anyway.

[Iavgotregigias6]

you used a calculator and its not that

hint:if you learned about remainders well it has 1 in

[jacksparrow]

whats 48dividedby 7


no divided by signs
48 divided by 7 is 6.857142 then it repeats itself.

[Mrdemolisher]

Someone else give us a hard one!

[Iavgotregigias6]

48 divided by 7 is 6.857142 then it repeats itself.


nope its 6r6

[secretwepon]

whats 300000 x 4.87 = ?

[Mrdemolisher]

Remainders are not used by scientists and once you get into middle school, they expect you to get the exact answer, not something like 5 remainder 3.
I'll give you guys a hard one: 100 x 100 x 100 x 100 x 100 x 100 x 100/1,000,000,000,000,000 =?
I am looking for a decimal answer, not something with remainders.

[Mrdemolisher]

secretwepon, is it 1,461,000?
I didn't use a calculator.

[secretwepon]

correct.

[jacksparrow]

what's 300 x 30 - 9(9+80) divided by 4?

[Mrdemolisher]

That would be 9,000 x 89... divided by 4.
9,000 x 89 is 801,000.
801,000 divided by 4 is 200,250!

[jacksparrow]

wrong.

[Mrdemolisher]

Duh, I forgot the - 9!
Sorry!
Wait... does this all coincide with the Order of Operations, or can I just do it in order?

[jacksparrow]

you have to apply to the rules of Order of Operationds, the rules of math, i hnate them.

[Mrdemolisher]

what's 300 x 30 - 9(9+80) divided by 4?
There we go... Is it 1,802,250?

[jacksparrow]

no. it's..i'm not telling you waht it is.

[Mrdemolisher]

Until I get it right, right?

[Mrdemolisher]

what's 300 x 30 - 9(9+80) divided by 4?
I think I finally have it... 8,799.75???

[jacksparrow]

no. it's a lot lower.

[Mrdemolisher]

what's 300 x 30 - 9(9+80) divided by 4?
I don't understand. 300 x 30 = 9,000...
9 x (9 + 80) = 801...
801 divided by 4 = 200.25!
And 9,000 - 200.25 = 8,799.75!
What did I do wrong???

[jacksparrow]

I don't understand. 300 x 30 = 9,000...
9 x (9 + 80) = 801...
801 divided by 4 = 200.25!
And 9,000 - 200.25 = 8,799.75!
What did I do wrong???
in the order of operations Parenthesis first.

[Mrdemolisher]

in the order of operations Parenthesis first.
I know that. 9 + 80 = 89. And 9 x 89 = 801.

[Lukario]

Okay, how about 2x+4(x-7)=3?

Thanks,
Lukario

[Mokarachi]

umm, well I haven't done math in nearly 3 years, but for that one Lukario I finished with 6x=31, or x=5.16

A bat and a ball cost 90 cents put together. The bat costs five times as much as the ball. What are the respective costs?

[Lukario]

It's actually x=4, because when you start out, you have 2x+4(x+7)=3. You then distribute the 4 to the x and the 7. You then get 2x+4x-21=3. Then you have 6x-21=3 when you add 2x and 4x. You then add 21 to both sides, and then you have 6x=24. You then divide and you get x=4.

For yours, it can be solved pretty easily using Algebra. But I haven't done Algebra in forever, so I'll probably get the answer wrong.

Let x=price of the ball
let 5x=price of the bat

So now you have x+5x=.90. Multiply everything by 10, and now you have 10x+50x=9. Add 10x and 50x, and now you have 60x=90. Divide and you get x=23, so therefore, the ball costs 23 cents and the bat costs something and the answer is wrong.

Thanks,
Lukario

[Iavgotregigias6]

Remainders are not used by scientists and once you get into middle school, they expect you to get the exact answer, not something like 5 remainder 3.
I'll give you guys a hard one: 100 x 100 x 100 x 100 x 100 x 100 x 100/1,000,000,000,000,000 =?
I am looking for a decimal answer, not something with remainders.

oh srry fort you guys were 9

67+0.1+100.34=168.35 hehe I will tell you a diffrent one

748.13+4567.123=

[Mokarachi]

It's actually x=4, because when you start out, you have 2x+4(x+7)=3. You then distribute the 4 to the x and the 7. You then get 2x+4x-21=3. Then you have 6x-21=3 when you add 2x and 4x. You then add 21 to both sides, and then you have 6x=24. You then divide and you get x=4.


Distributing the 4 to x and 7 gives you 2x+4x-28, not -21.

For mine, you complicated it a bit.
5x = bat
x = ball.
90=6x
15=x
So....
5(15)= bat
15= ball.

In cents, of course. No need for a decimal.

[Lukario]

OMG you're right. I always used to make those mistakes and I hate doing it too.

Thanks,
Lukario

[Iavgotregigias6]

can someone do my qestion

[Mokarachi]

can someone do my qestion
5315.253

The sum of two numbers is 91. The larger number is 1 more than four times the smaller number. Find the numbers.
HINT: SAME TYPE OF PROBLEM AS MY LAST ONE.

[Iavgotregigias6]

well I got 5215.136 when I did it in my head

[Mokarachi]

.13 also = .130. I think you made it
.123+
.013

That would equal what you got...Didn't carry a 1 in the hundreds place either.

[Iavgotregigias6]

lol ok give me some hard one's

[GamerGuy]

Try this.


6,888 divided by 998564 multiplied by 4666 plus 9999999999 minus 1 plus 1 minus 1 plus 1 minus 1 plus 1 minus 1 plus 1.

[xxblackXheartxx]

What is the point in which the two points cross?

2x+y=5
5x+3y=6

[suffer]

do this one,



50x1000x40000x.99000x100200= (answer here)



lmfaoooooooooooooooooooooooooooooooooooooooo

wait till u think about it, its like the hardest math question in multiplication




also how many numbers does PI have, this is a trick question!

[Aidyl]

Pi has infinity numbers. :D

[LINK7777]

50x1000x40000x.99000x100200=19839600000000000000

[Mokarachi]

blackheart - I totally forgot how to do graphs w/ intersection. Refresh me and give another :)

[suffer]

Pi has infinity numbers. :D

wrong, it has 671 total numbers

[Sakora]

whats 5x25 to the 5th power?

[Mokarachi]

wrong, it has 67 total numbers

Pi...
3.141592653589793238462643383279502884197169399375 1058209 74944592307816406286208998628034825342117067982148 08651 32823066470938446095505822317253594081284811174502 8410270193 852110555964462294895493038196.

Anyway, that 5x25^5 = 48,828,125

[xxblackXheartxx]

do this one,



50x1000x40000x.99000x100200= (answer here)



lmfaoooooooooooooooooooooooooooooooooooooooo

wait till u think about it, its like the hardest math question in multiplication




also how many numbers does PI have, this is a trick question!

19,839,600,000,000,000,000

[LINK7777]

Here one thats real hard.

If x*x + 2x - 35 = 0,
then x = ?

Solve this one if you can.

I know the answer.

[Mokarachi]

that's a nice one.
x^2+2x = 35.

uhmmm...I don't remember from there.

[LINK7777]

Try to find X.

If x*x + 2x - 35 = 0,
then x = ?

This may be hard but don't give up.
Hint: The answer is between 1-10.

[suffer]

dude


x*x+2x-35=0?


x= 8.75

[suffer]

8.75*4 = 35, so ha!

[LINK7777]

No, because 8.75*8.75=76.5625 and 8.75*2=17.5
and you add that and get 94.0625 that is not right.
Hint: The answer is not a decimal.

[suffer]

prime factorization? lol

[suffer]

2.1875 = x


2.1875*2+2.1875*2=35-35=0


i think i got it now

[Mokarachi]

Oh yeah...you have to set it equal to zero! Too bad that's all I remember.
I remember in these types of problems, sometimes there's two answers. I figured it out in my head, but what's the mathematical way?

x=5

[LINK7777]

Mokarachi is correct it is 5.
Good job.:TooHappy:

[Mokarachi]

Yeah, but what's the "show your work" way?

[LINK7777]

5*5=25 then 5*2=10
25+10=35
35-35=0
X=5
That is the work.:TooHappy:

[xxblackXheartxx]

Here one thats real hard.

If x*x + 2x - 35 = 0,
then x = ?

Solve this one if you can.

I know the answer.

the answer is x=5.

[Mokarachi]

hmm, for problems like that that have 2 answers there's more work, but I can't remember how to do it.

[LINK7777]

Here is one that should be fun.

X*X+10X+10X+6X+5=365
X=?

[Mokarachi]

x= 10
x= -36

[LINK7777]

It is one of your answers.:TooHappy:
Only one.

[Mokarachi]

Oh yea, damnit. It's 10, hah.
I forgot to take out the one that didn't make sense when it's applied.

[LINK7777]

Your right.:TooHappy:

Here's another.

3X+2X-25=0

[Aidyl]

does x=5?

[jenjen94]

Well I think it would be x=-5 not 5

[Aidyl]

no.
3x5+2x5-25=0.
15+10-25=0.
25-25=0.

[LINK7777]

does x=5?

You are right.:TooHappy:

[LINK7777]

Here's another.

7X-7=7777

This one should be fun.:TooHappy:

Sorry about Double posting.

[Aidyl]

x equals 1112.

[Mokarachi]

She got it.

[LINK7777]

Here is another.
972.125
4X+4X=7777
X=?

[Mokarachi]

Decimals eh?
972 and an 8th ;)

Here's one...
8!-3!

[LINK7777]

972.125
Did you see that the answer was on the page the whole time, it was in white in between:
Here is another.
972.125
4X+4X=7777
X=?

Cheak it out.:TooHappy:

P.S. It is also at the top of the page.

Here is the answer to your question -24.:TooHappy:

[Mokarachi]

24? Fraid not ;)

[LINK7777]

It should be -24 ,because if you times 8*0 you get 0 right so if you times 8*3 you get 24, but if you times 8*-3 you get -24.

[LINK7777]

Here's one.

2X+2X=777 ------------------------------------------------------Answer: 194.25
X=?

[Mokarachi]

Link - 8! only goes from
8x7x6x5x4x3x2x1, not to 0

Now that you know, go find it out again :)

[Aidyl]

this is from Link's.
x=194.25