Question

after 15 years hema's age will become 4 times that of her present age find her present age

Answer 1

her age is 15years now.

Answer 2

let hema's present age be x years.
then,after 15 years her age will be 4x years.
so,we can say , ⇒x +15 = 4x
⇒15 = 4x + x
⇒15/5=x=3 
∴her present age = 3 years (ans)