# Easy Math equation

Discussion in 'Off-Topic' started by PROXY, Feb 6, 2011.

### 3D Modeling Reviewer

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Okay, here is my problem:

Today, Mr. A, is 4x older than his son Lukas. 2 Years ago, he was 6x older as his son 3 years ago.

How old is Lukas?

If anyone can make it for me, I would be very glad. I'm somewhat having some problems ^^ +rep for help

2. ### Argus

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Lukas is 8 years old I belive.

x=4y
x-2=6(y-3)
4y-2=6(y-3)
4y-2=6y-18
4y+16=6y
2y=16
y=8

3. ### The_wand_mirror

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is that even a sentence.

4. ### Chizume

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I'm thinking Lukas is 8 years old.

If he was 8 years old Mr. A would be 30 when he was 5.
Then, today Mr. A is his son's age times four, which means he would be 32 and two years ago he was 30.

Right?

5. ### Kuvion

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My equations:
With A being Mr. A's age and L being the age of Lukas

A = 4*L

A-2 = 6*(L-3)
A = 6*(L-3)+2

4*L = 6*(L-3)+2
4*L = 6*L-18+2
2*L = 3*L-8
L = 8

8 is correct

6. ### DonDustin

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it should be:
x=4y
x-2=6(y-5)
if I understand the last part correctly.

I just made it via testing and found out that the man is 56 and Lukas is 14.

Proof:

56=4x14
56-2=6(14-5)
->54=6x9

Edit: ok it just seems that I understood this task a bit wrong

Last edited: Feb 6, 2011
7. ### The_wand_mirror

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how can "2 Years ago, he was 6x older as his son 3 years ago" not be a mindfuck to you guys? :s

8. ### MySpaceBarBroke

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Uh, logic?

Don't do drugs, kids.

9. ### The_wand_mirror

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Well it really doesn't make any fucking sense to me lol.

"There is a car there but it's not there where it is because it's there where it's not" makes more sense.

But english is not my main language so... muh?

10. ### Raven0

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THAT'S THE POWER OF MATH KIDS!

11. ### Coolty44

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math =/= English

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Power of Logic

### 3D Modeling Reviewer

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didn't expect so many posts ^^

anyway, thank you all for your help and... assistant
I suppose, it's solved now. Thanks again

14. ### Chizume

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I should post my math homework

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I was sort of thinking in those lines myself :3

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x=4y
x².3.14= z
z+1/2= y
=> x= 8