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Average age of 7 girls is 12. When age of a boy is included the average becomes 13 years. Find the age of boy.

A15

B18

C16

D20

Answer:

D. 20

Read Explanation:

20 Total age of 7 girls = 84 Total age of 8 students when boys is included = 13 x 8 = 104. Age of boys = 104 - 84 = 20


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