The average age of a class of 25 girls is 16 years. If 5 new girls having average age of 10 years join the class, then the average age of the class becomes:
Total age of 25 girls = 25 × 15 = 400 years Total age of 30 girls = 400 + (5 × 10) = 400 + 50 = 450 years Therefore new average age = 450/30 = 15 years
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