Multiplicative Comparison Word Problems

Adan went bird watching last month. He say three times as many robins as sparrows. If the total number of birds Adan saw was 28, how many sparrows did Adan see?

At the pet store there are 4 times as many parakeets as parrots. If there are a total of 30 parakeets and parrots, how many are parrots?

Estefania collects sea shells. She has 3 times as many clam shells as turret shells. If she has a total of 20 shells, how many clam shells does she have?

Lyla took her dog to the dog park. She saw 5 times as many Chihuahuas as terriers. She saw a total of 24 Chihuahuas and terriers. How many terriers did she see?