Question

The average age of a class of 21 girls is 16 years. If 4 new girls having average age of 11 years join the class, then the average age of the class becomes:

A 12.5 years Correct Answer Incorrect Answer
B 16 years Correct Answer Incorrect Answer
C 15.2 years Correct Answer Incorrect Answer
D 14 years Correct Answer Incorrect Answer

Solution

Total age of 21 girls = 21 × 16 = 336 years Total age of 25 girls = 336 + (4 × 11) = 380 years Therefore new average age = 380/25 = 15.2 years

Practice Next
×
×