Question

after 15 years ,Mary's age will be four time of her present age .find her present age

Answer 1

Heya !!

Let present age of Mary be X years.

After 15 years age of Mary = ( Present age + 15 ) = X + 15.

According to the question,



Age of Mary after 15 years => 4 ( Present age )


X + 15 = 4X

3X= 15

X = 5 years.

Hence,

Present age of Mary = X = 5 years.

Answer 2

Let present age of Mary will be x

After 15 years mary's age = x+15

By given problem

x+15=4x

15=4x-x

3x=15

x = 5

Therefore,present age of Mary is 5years