Question
The average age of 21 girls is 43 years. If the age of
two more girls is added the average decreases by three years. What is the sum of the age of new girls? TYPE 2Solution
Total age of 21 girls = 21 × 43 = 903 years  If the age of two more girls is added the average decreases by three years,  ∴ Total age of 23 girls = 40 × 23 = 920 Now, the sum of the age of new girls = 920 – 903 = 17 years
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