Question

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

Answer 1

let her present age be x..after 15 years her age will be 4x that means..
x+15=4x
15=4x-x
15=3x
x=15/3
=5
so her present age is 5 and after 15 years...she will be of 20 i.e 4 times of 5

Answer 2

5 years is the present age of Mary.

Given:

After 15 years Mary’s age will be four times of her present age.

To find:

Present age of Mary  = ?

Solution:

Let the present age of the Mary would be x years.

After 15 years Mary’s age is four times of her present age.

According to the condition given the term can be written as

15 + x = 4x

3x = 15

x = 5.

After 15 years the age of Mary is 20.

Hence, the present age of Mary is 5 years.