Puzzle Details
My current age, is the age of my friend (who is 14), plus one third of my age.
How old will I be when my friend is twice their current age?
Puzzle Copyright © Kevin Stone
hint
answer
workings
A box for your workings out:
Hint: A little algebra might help.
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 friend is currently 14, when they are 28 (double their age) I will be 35.
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