Question
The average age of a class of 27 girls is 18 years. If 3
new girls having average age of 8 years join the class, then the average age of the class becomes:Solution
Total age of 27 girls = 27 × 18 = 486 years Total age of 30 girls = 486 + (3 × 8) = 510 years Therefore new average age = 510/30 = 17 years
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