The average age of a class of 17 girls is 12 years. If 3 new girls having average age of 8 years join the class, then the average age of the class becomes:
Total age of 17 girls = 17 × 12 = 204 years Total age of 20 girls = 204 + (3 × 8) = 228 years Therefore new average age = 228/20 = 11.4 years
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