Question
The average age of a class of 23 girls is 15 years. If 2
new girls having average age of 10 years join the class, then the average age of the class becomes:Solution
Total age of 23 girls = 23 × 15 = 345 years Total age of 25 girls = 345 + (2 × 10) = 365 years Therefore new average age = 365/25 = 14.6 years
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