Which number when added to each of the numbers 6, 7, 15, 17 will make the resulting numbers proportional?
A6
B5
C4
D3
A6
B5
C4
D3
Related Questions:
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?