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Posted on Jan 02, 2017
SOURCE: The average age of 3
The average is 20, it means the total is 60. The sum of ratio is 15 (3+5+7)
Therefore the age of a girl is calculated by multiplying the respective ration with total and dividing by sum of ratio
Age of Eldest girl = 7 x 60 /15 = 28
Hope it helps! Good Luck!
Posted on Feb 15, 2011
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