Question
The average age of a class of 20 girls is 16 years. If 4
new girls having average age of 10 years join the class, then the average age of the class becomes:Solution
Total age of 20 girls = 20 × 16 = 320 years Total age of 24 girls = 320 + (4 × 10) = 360 years Therefore new average age = 360/24 = 15 years
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