The total of the ages of a class of 60 girls is 900 years. The average age of 20 girls is 12 years and that of the other 20 girls is 16 years. What is the average age of the remaining girls?
15 years
None of these
14 years
17 years
16 years
(20)12 + 20(16) + 20x = 900
20x = 900 − 240 − 320
20x = 340
x = 17 years
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IBPS Clerk Prelims 2016
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