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In a class, 40 boys and their average age is five-sixth of the number of girls in that class and 30 girls and their average age is half of the number of boys in that class. Find the overall average in the class (Approximately)

A23

B26

C28

D20

Answer:

A. 23

Read Explanation:

Required average = ((40*25) + (30*20))/70=1600/70=23 years


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513=\frac{5}{1- \sqrt3}=