Question
The average age of a class of 24 girls is 15 years. If 6
new girls having average age of 10 years join the class, then the average age of the class becomes:Solution
Total age of 24 girls = 24 × 15 = 360 years Total age of 30 girls = 360 + (6 × 10) = 420 years Therefore new average age = 420/30 = 14 years
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