SSC CGL Tier II 25 Oct 2015 Paper 1

Question : 64 of 100

Marks: +1, -0

The average age of 30 students of a class is 14 years 4 months. After admission of 5 new students in the class the average becomes 13 years 9 months. The youngest one of the five new students is 9 years 11 months old. The average age of the remaining 4 new students is

11 years 2 months
13 years 6 months
12 years 4 months
10 years 4 months

Validate

Solution:

(4) Total age of initial 30 students = 14 years 4 months × 30 = 430 years
Total age of 35 students = 13 years 9 months × 35 = (455 + 26) years 3 months = 481 years 3 months
∴Total age of 4 new students= 481 years 3 months – 430 years – 9 years 11 months = 481 years 3 months – 439 years 11 months = 41 years 4 months
∴Required average

={42\years 4 \months}/4

= 10 years 4 months

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