Question

Sindhu is 40 years old and smita is 20 years old.How many years ago was sindhu three times as old as smita??

Answer 1

Step-by-step explanation:

Take the average

=(40-20)/2

10

Answer 2

Answer:

10 years ago, Raju was 3 times that the age of Surbhi.

Step-by-step explanation:

Solution :

Raju = 40 years

Surbhi = 20 years

Let the years that to be subtracted be y

sandhu= 40 - y

Smitha= 20 - y

★ According to the question,

sandhu was 3 times smitha's age -

⇒ (40 - y) = 3(20 - y)

⇒ 40 - y = 60 - 3y

⇒ -y + 3y = 60 - 40

⇒ 2y = 20

⇒ y = 20/2

⇒ y = 10

Therefore, 10 years ago, sandhu was 3 times that the age of Smita

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★ Verification:

sandhu 10 years back = 40 - 10 = 30

Smthi 10 years back = 20 - 10 = 10

As the question says, sandhu was 3 times the age of Smita

⇒ 10 × 3 = 30

Hence proved, that sandhu was thrice the age of Smita 10 years ago.

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