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the average age of an adult is 40 years 12 new students with an average age of 32 years join the class thereby decreasing the average of the class by 4 years the original strength of the class was |
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Answer» The average age of an adult=40 years. let number of ADULTS be x. So SUM of all ages of adults =40(x)= 40x . Sum of all 12 students of average age of 32 years=32(12)=384 . Sum of ages of adults and students =40x+384 .As average drops by years , new average of this group=36 years . Number of members in this group=x+12 => 36= 40x+384/x+12 |
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