B.Ed (CHANDIGARH) 2018 Entrance Exam With Answers

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81.

The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child in years?

A: 4

B: 7.6

C: 10

D: 8

The answer is: A

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Explanation

Let's denote the age of the youngest child as x. Since the ages of the children are in intervals of 3 years, the ages of the five children can be represented as x, x+3, x+6, x+9, and x+12.

According to the given information, the sum of their ages is 50 years:

x + (x+3) + (x+6) + (x+9) + (x+12) = 50

Simplifying the equation:

5x + 30 = 50

Subtracting 30 from both sides:

5x = 20

Dividing both sides by 5:

x = 4

Therefore, the age of the youngest child is 4 years.

The correct answer is A) 4.