The average age of 5 boys is 15 yr . If an other boy of 15 yr joins them , find the average of the whole group.
(A)14yr (B)16yr
(C)17yr (D)15yr
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Answer:
15yr
Step-by-step explanation:
initial
average of 5 boys = 15
total age = 15×5
=75
final
when new boy comes,
total age= 75+15=90
new average =90/6
=15
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