The ratio of boys and girls among 520 students of class A and 930 students of class B is 7 : 6 and 16 : 15. respectively. The ratio of girls to the total students combined for classes A & B is? |
145 : 69 69 : 145 69 : 76 69 : 73 |
69 : 145 |
Class A → B : G 7 : 6 = 13 ↓ ↓ ×40 ×40 240 520 Class B → B : G 16 : 15 = 31 ↓ ↓ ×30 ×30 450 930 Total girls in class A and Class B = 240 + 450 = 690 Total students in both classes = 520 + 930 = 1450 Required Ratio = 690 : 1450 = 69 : 145 |