Question

The New Age School is very strict about its intake and takes in only students of the same age in a particular division. Class Xth has two divisions: A, having 20 girls all of the same age; and B, having 30 boys all of the same age. The average age of the girls and that of the boys is however different. Few girls from division A were transferred to division B and an equal number of boys were transferred from division B to division A. Now the average age of students in the two divisions is equal. How many students were transferred from a division to the other division? ( a ) 10 ( b ) 12 ( c ) 15 ( d ) Data Insufficient

Answer 1

Answer :

(c) 15 i think so

but maybe also it can be (a) 10.