Question

I am three times as old as my son. five years later I shall be two and a half times as old as my son. how old am I and how old is my son

Answer 1

Let my age and son's age be x and y years.
Given, x = 3y
x + 5 = 5(y + 5)/2
=> 3y + 5 = 5(y + 5)/2 = (5y + 25)/2


=> 6y + 10 = 5y + 25
=> y = 15
x = 3 X 15 = 45
Hence, my age and son's age are 45 years and 15 years. 

Answer 2

Answer:

Step-by-step explanation:

Let my age and son's age be x and y years.

Given, x = 3y

x + 5 = 5(y + 5)/2

=> 3y + 5 = 5(y + 5)/2 = (5y + 25)/2

=> 6y + 10 = 5y + 25

=> y = 15

x = 3 X 15 = 45

Hence, my age and son's age are 45 years and 15 years.