The average age of 20 boys in the class is 15.6 years. Five new boys join and the new average becomes 15.56 years. What was the average age of the five new boys?

15.5

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15.4

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15.25

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15.3

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None of these

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Solution

The correct option is B 15.4
Average age of the five new boys
$= (25 \times 15.56 - 20 \times 15.6) \div 5$
$= 15.4 y e a r s$

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