The sum of the present ages of a mother and a son is 50 years. 4 years ago, the ratio of their ages was 6 : 1. Find the current age of the mother.

  1. 35 years
  2. 40 years
  3. 42 years
  4. 45 years

Answer (Detailed Solution Below)

Option 2 : 40 years
Free
RRB NTPC Graduate Level Full Test - 01
100 Qs. 100 Marks 90 Mins

Detailed Solution

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4 years ago, the ratio of their ages was 6 : 1.

Let their ages be measured in terms of unit x.

So, presents the age of a mother is 6x + 4 and the present age of a son is x + 4.

The sum of the present ages of a mother and a son is 50 years.

According to problem:

(6x + 4) + (x + 4) = 50

⇒ 6x + 4 + x + 4 = 50

⇒ 7x = 50 – 8

⇒ 7x = 42

⇒ x = 6

So, the present age of mother is 6x + 4 i.e, (6 × 6) + 4 = 40 years.

Hence, 40 years is the correct answer.

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