The average age of 80 girls is 15 years and the average age of x boys is 20 years. If the average age of all is 16 years, find the number of boys (x).
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Explanation: Total ages of 80 boys = 15 x 80 = 1200 yrs. Total age of 25 boys = 14 x 25 = 350 yrs. Average age of remaining boys = 1200 - (240+350) / 80 - (25+15) = 610/41 = 15.25 yrs.
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the 16 what i have written the mean of sum of ages girls and boys
the 1200 what I have written is sum of all the ages of girls alone
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