What should be added to each term of the ratio `7: 13` so that the ratio becomes `2:3`

What must be added to each term of the ratio 3 : 5 so that the new ratio becomes 5 : 6 ?

What number should be added to each term of the ratio 2a : 3b so that the ratio of the additions will be c : d ?

What number must be added to each term of the ratio 7:5 so that it becomes 4:3?

What must be added to each term of the ratio 2:5 so that it may become equal to 5:6?

What must be added to each term of the ratio 2:5 so that it may become equal to 5:6?

what number should be added to each term of the ratio 2:5 so that is may become equal to 5:6?

What number must be subtracted from each term of the ratio 17 : 33 so that the ratio becomes 7 : 15