Question
The average age of a class of 22 girls is 18 years. If 2
new girls having average age of 12 years join the class, then the average age of the class becomes:Solution
Total age of 22 girls = 22 × 18 = 396 years Total age of 24 girls = 396 + (2 × 12) = 420 years Therefore new average age = 420/24 = 17.5 years
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