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Question 26
The average. age of 10 children in a class is 12 years. If two children aged 14 and 16 years join the class,itwill raise the average age by how much?
Solution
Sum of ages of children at start = 12*10 = 120 years
Sum of ages after new joinees join = 120 + 14 + 16 = 150 years
Average age now = 150/12 = 12.5 years
Hence, average age has increased by 6 months.Â
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