Question
The average age of 15 girls is 45 years. If the age of
one more girl is added the average decreases by half a year. What is the age of new girl?Solution
Total age of 15 girls = 15 × 45 = 675 years  If the age of one more girl is added the average decreases by half a year,  ∴ Total age of 16 girls = 44.5 × 16 = 712  Now, Age of the new person = 712 – 675 = 37 years
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