Strength of Class
The average age of a
adult class is 40 years. Twelve new students with an average age of 32 years join the class, thereby decreasing the average of the class by 4 years. The originals strength of the class was:
The answer is 12.
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Let 4 0 n + 3 2 ( 1 2 ) be the summation of all the students at present. n + 1 2 4 0 n + 3 2 ( 1 2 ) = ( 4 0 − 4 ) n = 1 2