Question
The average age of a class of 24 girls is 16 years. If 6
new girls having average age of 12 years join the class, then the average age of the class becomes:Solution
Total age of 24 girls = 24 × 16 = 384 years Total age of 30 girls = 384 + (6 × 12) = 456 years Therefore new average age = 456/30 = 15.2 years
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