Question

At the city park there were 15 blue jays, 6 cardinals, and 9 mockingbirds. For each of the following questions set up a proportion equation and solve for the unknown. 1. If there were 6 mockingbirds, how many cardinals would there be at the park? 2. If there were 5 blue jays, how many cardinals would there be at the park? 3. If there were 20 cardinals, how many mockingbirds would there be at the park?

Answer 1

1. 4 cardinals because: 6 mockingbirds : x cardinals = 9 mockingbirds : 6 cardinals 6*6 / 9 = 4 2. 2 cardinals because: 5 blue jays : x cardinals = 15 blue jays : 6 cardinals 5*6 / 15 = 2 3. 30 mockingbirds because; 20 cardinals : x mockingbirds = 6 cardinals : 9 mockingbirds 20*9 / 6 = 30