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Q.

Shobo’s mother’s present age is six times Shobo’s present age. Shobo’s age five years from now will be one third of his mother’s present age. What are their present ages?

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a

The present age of Shobo is 5 years and Shobo’s mother is 30 years.

b

The present age of Shobo is 6 years and Shobo’s mother is 35 years.

c

The present age of Shobo is 12 years and Shobo’s mother is 40 years.

d

The present age of Shobo is 1 years and Shobo’s mother is 28 years.

e

answer is A.

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Detailed Solution

It is given that Shobo’s mother’s present age is six times Shobo’s present age. Shobo’s age five years from now will be one third of his mother’s present age.
Let the present age of Shobo is x years, then Shobo’s mother present age will be 6x year.
Linear equation will be,

x + 5 = 13 × 6 x

Simplifying,

⇒ 3 × x + 5 = 6 x ⇒ 3 x + 5 × 3 = 6 x ⇒ 3 x + 15 = 6 x

Transposing 6x to the left hand side and 15 to the right hand side.

⇒ 3 x − 6 x = − 15 ⇒ − 3 x = − 15 ⇒ x = − 15 − 3 ⇒ x = 5

The present age of Shobo is 5 years.
The present age of Shobo’s mother is,
Question Image

Hence, the present age of Shobo and Shobo’s mother is 5 and 30 years respectively.
Correct option is 1.

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