Question

Twenty years ago, my age was 1/3 of what it is now. What is my age

Answer 1

20 years ago my age was 1/3 of what it is now
:
Let a = age now
a/3 = a - 20
multiply both sides by 3
a = 3(a-20)
a = 3a - 60
60 = 3a - a
60 = 2a
a = 30 yrs now