The average age of 4 boys is 13 years. If one of them is 10 years old, what is the average age of the remaining boys?
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Answer:
average = sum of age /number of boys
sum of age = average*number of boys
=13*4
= 52
Sum of age 3 boys = 52 - 10
= 42
average age of three boys = 42/3
= 14
and
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