Question
The average age of a class of 35 girls is 27 years. If 7
new girls having average age of 12 years join the class, then the average age of the class becomes:Solution
Total age of 35 girls = 35 × 27 = 945 years Total age of 42 girls = 945 + (7 × 12) = 1029 years Therefore new average age = 1029/42 = 24.5 years
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