Question

The average age of a class of 23 girls is 15 years. If 2 new girls having average age of 10 years join the class, then the average age of the class becomes:

A 17.5 years Correct Answer Incorrect Answer
B 13.6 years Correct Answer Incorrect Answer
C 15.2 years Correct Answer Incorrect Answer
D 14.6 years Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

Total age of 23 girls = 23 × 15 = 345 years Total age of 25 girls = 345 + (2 × 10) = 365 years Therefore new average age = 365/25 = 14.6 years

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