Question
The average age of 22 girls is 40 years. If the age of
two more girls is added the average decreases by 2.5 years. What is the sum of the age of new girls?Solution
Total age of 22 girls = 22 × 40 = 880 years  If the age of two more girls is added the average decreases by 2.5 years,  ∴ Total age of 24 girls = 37.5 × 24 = 900 Now, the sum of the age of new girls = 900 – 880 = 20 years
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