The average age of a group of 5 bus is 15 years. Another boy of 15 years join them,the average of whole group will be
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it will be 15 only as the average will be the same
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sum of age of 5 boys is = 15x5=75
another boy of 15yr join then total age =75+15=90
- so, average age of whole group =90/6=15yr
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