Division CANNOT be commutative, here is why
lets say the problem is 24÷4
it is obviously 6
but when you flip 24÷4, you get 4÷24
and... 4÷24 is 0.16666666
6 and 0.1666 is totally different :p
So,
The ratio of dogs to cats:

The other proportion:


5 times 28 is 140.
Multiply the fraction by the appropriate form of 1

There are 56 dogs when the number of cats is 140.
The difference between 90% and 72% is 18%
40 ft of 60% (.6) = 24ft
Area- 24(40)=960ft
B. Full purpose credit card?
I feel like that makes sense.