Question
The average age of a class of 20 girls is 14 years. If 5
new girls having average age of 9 years join the class, then the average age of the class becomes:Solution
Total age of 20 girls = 20 × 14 = 280 years Total age of 25 girls = 280 + (5 × 9) = 325 years Therefore new average age = 325/25 = 13 years
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