The average age of 40 students of a class is 18 years. When 20 new students are admitted to the same class, the average age of the students of the class is increased by 6 months. The average age of newly admitted student is
Options:
A . 19 years 6 months
B . 19 years
C . 20 years 6 months
D . 20 years
Answer: Option A Answer: (a)Total age of 20 new students = (60 × 18.5 – 40 × 18) years = (1110 – 720) years = 390 years ∴ Their average age = $390/20$ = 19.5 years = 19 years 6 months
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