Question

After 15 years, Mary's age will be four times of her present age . Find her present age?

Answer 1

Answer: 5 years.

Step-by-step explanation: Mary's present age = x

Mary's age 15 years later = x + 15

So, x + 15 = 4x

15 = 4x - x

15 = 3x

x = 15/3 = 5

Therefore, Mary's present age is 5.