SOLUTION: there are 30 boys and 60 girls in a class. if the average age of boys is 12 year and average age of girls is 10 year, what will be the average age of the whole class?
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Question 824690: there are 30 boys and 60 girls in a class. if the average age of boys is 12 year and average age of girls is 10 year, what will be the average age of the whole class? Answer by TimothyLamb(4379) (Show Source):
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average age of the whole class
(12*30 + 10*60)/90 = 10.666666 = 10+2/3
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