Answer:
Let's set up an equation with x as the number of times 5 and 4 are being multiplied (remember that 5:4 is a ratio, we don't know how many dogs and cats there are, just that the ratio of dogs to cats is 5:4):
5x+4x=153
9x=153
x=17
4x=4⋅17=68
There are 85 dogs (5⋅17) and 68 cats (85:68=5:4)
