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The average age of a class is 19 years. While the average age of boys is 20 and the average age of girls is 17. If the number of boys is 20 then find the number of girls in the class?
10
15
16
18
Average of class = 19 = Sum/(b+g) sum (girls) = g*17 sum (boys) = b*20 19b + 19g = 17g + 20b 2g = b = 20. So girls = 10
By: Sandeep Dubey ProfileResourcesReport error
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