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The average age of an adult class is 40 years .12 new students with an average age of 32 yearsJoin the class, thereby decreasing the average of the class by 4 years the original strength of theclass was: |
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Answer» Average age of x students=40Total age=40x Average age of 12 students=32Total age=32*12=384Average age of x+12=40-4Total age =x+12=36=x=24 Let, initially x student presentInitially total age of adult class=40xafter 12 new students join, total students is x+12 & total age is 40x + 12×32a/c to que, 36×(x+12) =40x +12×324x=12×4x=12 |
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