My current age is the age of my favourite book (which is 14 years old) plus one third of my age.
How old will I be when my favourite book is twice its current age?
Puzzle Copyright © Kevin Stone
workings
hint
answer
print
Share link: www.brainbashers.com/puzzle/znth
Hint
A little algebra might help.
Answer
I will be 35 in 14 years.
Reasoning
I am currently 21.
If x is my current age, then:
x = 14 + x
—
3
so
2x = 14
——
3
and
2x = 42
So
x = 21
I am currently 21 and my favourite book is currently 14 years old, when it is 28 years old (double its age) I will be 35.
