The ratio of the number of boys in schools A and of B is 5 ∶ 7 and the ratio of the total number of students in A and B is 3 ∶ 4. If the number of girls in B is equal to 66 % of the total students in B, then what is the ratio of the number of girls in A and B?
If the denominator of a fraction is multiplied by 2 and the numerator is increased by 2, the fraction becomes . If instead, the numerator is multiplied by 2 and the denominator is increased by 2, it becomes What is the sum of the numerator and the denominator of the original fraction (in the lowest form) ?