the average age of 4 boys is 22.5 is it decreases by 6 months when a new boy is included in the group.find the age of the new boy.
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Step-by-step explanation:
Average age =22.5
no. of boys = 4
TOTAL AGE = 22.5 x 4 = 90
NOW NO. OF BOYS =5
NEW AVERAGE AGE = 22.5-0.6=21.9
TOTAL AGE = 21.9 x 5 = 109.5
Age of new boy = 109.5 - 90 = 19.5
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