Subject :IMO Class : Class 8
Twenty years ago, my age was 
of my present age. What will be my age after fifteen years?
A66 years
B45 years
C33 years
D35 years
Can anybody help me with this question as my answer was coming 30 but the answer is 45?
Ans 1:
Class : Class 10
This equation is formed like that:
Let present age =x
Twenty years ago=x-20
A.T.C
x-20 = 1/3 ×x
-20 =1/3x-x
-20 = -2/3x
20÷2/3 =30 years
Age after 15 years =30+15 =45 years