the average age of 7 boys is 20 years.If the average age of six Boyd is 19 1/2 years then find the age of seventh boy
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23
Step-by-step explanation:
Given that,
The average age of 7 boys = 20 years
Then the sum of the age of 7 boys = 20 * 7 = 140 years
Given that ,
The average age of 6 boys = 19 1/2 years = 39 / 2 years
Then the sum of the age of 6 boys = 39 / 2 * 6 = 117 years
Hence, the age of 7th boys = 140 - 117 = 23 year
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