Question
The average age of 16 girls is 35 years. If the age of
two more girls is added the average decreases by 3.5 years. What is the sum of the age of new girls?Solution
Total age of 16 girls = 16 × 35 = 560 years  If the age of two more girls is added the average decreases by 3.5 years,  ∴ Total age of 18 girls = 31.5 × 18 = 567 Now, the sum of the age of new girls = 567 – 560 = 7 years
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