Question

The ratio of the number of cats to the number of birds at the shp is 2 : 5. The ratio of the number of birds to the number of birds to the number of rabbits is 1:3. What is the ratio of the number of cats to the number of birds to the number of rabbits. If there are 30 rabbits, how many cats are there at the pet shop?

Answer 1

c:b = 2:5
b:r = 1:3 = 5:15
So,
c:b:r = 2:5:15

So, if r=30,
c:30 = 2:15
c = 4