A class has 21 students. The ratio of girls to boys is 4 : 3. How many girls are there in the class ?
(A) 8
(B) 9
(C) 7
(D) 12
A class has 21 students. The ratio of girls to boys is 4 : 3. How many girls are there in the class ?
(A) 8
(B) 9
(C) 7
(D) 12