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:
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
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