The average age of 12 children is 20 years. If the age of one more child is added, the average is decreased by 1. What is the age of the child added later ?
A
9 years
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B
8 years
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C
7 years
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D
6 years
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Solution
The correct option is C7 years
Let the age of child added later be x years.
average age of 12 children =20 years
∴ Total age of 12 children =20×12=240 years
After one more child is added-
Average of 13 children =20−1=19 years
Average age of 13 children =sum of 12 children+x13