Puzzle Details

My current age, is the age of my brother (who is 14), plus one third of my age.

How old will I be when my brother is twice his current age?

Answer: I will be 35 (in 14 years time).

I am currently 21.

If x is my current age, then:

x = 14 + x
-
3
so

3x = 42 + x

and

2x = 42

So

x = 21

I am currently 21 and my brother is currently 14, when he is 28 (double his age) I will be 35.

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