The number of students in class 61 is equal to that in class 62. The ratio of boys in class 61 to girls in class 62 is 1:3, and the ratio of boys in class 62 to girls in class 61 What is the ratio of the number of girls in class 61 to that in class 62?

The number of students in class 61 is equal to that in class 62. The ratio of boys in class 61 to girls in class 62 is 1:3, and the ratio of boys in class 62 to girls in class 61 What is the ratio of the number of girls in class 61 to that in class 62?

Eight to nine
The ratio of the number of boys in class 61 to the number of girls in class 62 is 1:3
The ratio of the number of boys in class 62 to the number of girls in class 61 is 1:4
Because the number of class 61 and class 62 is equal, x + 4Y = y + 3x, x = 1.5y
So what's the ratio between the number of girls in class 61 and that in class 62? It's 4Y and 3x, 8 to 9