The average age of 14 girls is 42 years. If the age of two more girl is added the average decreases by one and a half year. What is the sum of the age of new girls?
Total age of 14 girls = 42 x 14 = 588 years If the age of two more girl is added the average decreases by one and a half year, Total age of 16 girls = 40.5 x 16 = 648 Now, sum of the age of new girls = 648 - 588 = 60 years
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