The average age of 40 students of a class is 15 years. When 10 new students are admitted, the average is increased by 0.2 year. The average age of the new students is :
Options:
A . 16 years
B . 15.2 years
C . 16.4 years
D . 16.2 years
Answer: Option A Answer: (a)Total age of 40 old students = 40 × 15 = 600 years. Total age of 40 old and 10 new students = 50 × 15.2 = 760 years ∴ Total age of 10 new students = 760–600 = 160 years. ∴ Required average age = $160/10$ = 16 years.
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