Question 152
During the first school hour the ratio of the number of boys and girls in the classroom was $3 : 4$. After 4 more girls entered the classroom and 4 boys left it before the second school hour, the ratio became $2 : 5$. How many more girls than boys were in the classroom during the second school hour?
(A) 5
(B) 6
(C) 7
(D) 8
(E) 12
(A) 5
(B) 6
(C) 7
(D) 8
(E) 12