If 17% of class A is transferred to class B, the number of class A is equal to that of class B______ .

If 17% of class A is transferred to class B, the number of class A is equal to that of class B______ .

The proportion of class B in class A is 1-17 × 2 = 57. The original number of class A is 1 / 57 = 75. So the answer is: 7, 5