AMC 8 1994 Problem 11

Last summer $100$ students attended basketball camp. Of those attending, $52$ were boys and $48$ were girls. Also, $40$ students were from Jonas Middle School and $60$ were from Clay Middle School. Twenty of the girls were from Jonas Middle School. How many of the boys were from Clay Middle School? $\text{(A)}\ 20 \text{(B)}\ 32 \text{(C)}\ 40 \text{(D)}\ 48 \text{(E)}\ 52$