Question
The average age of a class of 20 girls is 12 years. If 4
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 × 12 = 240 years Total age of 24 girls = 240 + (4 × 9) = 276 years Therefore new average age = 276/24 = 11.5 years
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