Question
The average age of 12 boys in the group is 9 years. If 2
more boys join the group, the average is increased by 1 year. What is the average age (in years) of the two new boys in the group?Solution
Average age of 12 boys in a group=9 years Total Age =12×9=108 years 3 more boys join the group so the total boys =12+2=14 boys And increased average by 1=9+1=10 years So total age of 14 boys =14×10 =140 years total age of new 2 boys =140-108=32 years average age of new 2boys = 32/2=16 years Â
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