Question 58
The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was
Solution
Le the number of students originally in a class be n.
By averages concept,Β
Ξ£N = 40n
Ξ£new = 32*12 = 384
new average = 36
Ξ£N +Β Ξ£new = 36(n+12)
40n + 384 = 36n + 432
4n = 48
n = 12
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