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 strength of the class was

(a) 10 (b) 11 (c) 12 (d) 15

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 strength of the class was

(a) 10 (b) 11 (c) 12 (d) 15

1 Answer

127 votes

Let the original strength of the class be

Sum of ages of the whole class = years.

Sum of ages of 12 new students = years = 384 years.

127 votes

127