Question

Ishaan is 72 years old and William is 4 years old.

How many years will it take until Ishaan is only 5 times as old as William?

Answer 1

It will take 13 years, when Ishaan is 75, William is 17. 75/5=17

Answer 2

It will take 13 years to Ishaan age will be 5 times William age. By this time William will be 17 years old and Ishaan will be 85 years old.

Explanation:

By expressing the age of Ishaan and William since today, we have.

I=72+x

W=4+x

Where x is years since today. We want the time for Ishaan age will be 5 times William's age:

I=5W

72+x=5*(4+x)

72+x=20+5x

72-20=5x-x

52=4x

x=13