Question
The average age of 12 girls is 35 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?Solution
Total age of 12 girls = 12 x 35 = 420 years If the age of two more girl is added the average decreases by one and a half year, Total age of 14 girls = 33.5 x 14 = 469 Now, sum of the age of new girls= 469 - 420 = 49 years
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