Question

After 15 years Kirti will be five times as old as she was 5 years ago. Determine her present age .​

Answer 1

Answer:

age of kriti be x

after 15 years age of kriti (x+15)

age of kriti 5 years ago(x-5

according to question

x+15= 5(x-5)

x+15=5x-25

x-5x=-25-15

-4x=-40

x=10

hence present age of kriti is 10 years

Answer 2

Answer:

The present age of Kirti is 10 years.

Step-by-step-explanation:

Let the present age of Kirti be x years.

∴ Age of Kirti 5 years ago = ( x - 5 ) years

Age of Kirti 15 years after = ( x + 15 ) years

From the given condition,

∴ ( x + 15 ) = 5 ( x - 5 )

⇒ x + 15 = 5x - 25

⇒ 15 + 25 = 5x - x

⇒ 40 = 4x

⇒ x = 40 ÷ 4

⇒ x = 10 years

∴ The present age of Kirti is 10 years.