There are 12 cats to every 9 dogs. If there are 100 dogs how many cats are there?

Answer 1

C/100 = 12/9 = 4/3, ratio of cats to dogs is the same, theoretically.

C/100 = 4/3 cross multiply, or equivalently think of it as multiplying both sides by 300

300(C/100) = 300(4/3)

3C = 4(100) = 400

3C = 400 divide by 3

3C/3 = 400/3

C = 400/3 = 133 1/3 cats, round that off to 133 cats (otherwise there's a major animal abuse crime being investigated)

Answer 2

100 dogs x 12 cats/900 dogs = 4/3 cats