Casey earns $150 a week and consumes only fish and shrimp. The price of fish is $3 a pound and the price of shrimp is $5 a pound. If Casey’s income rises to $210, he could buy a maximum of _ pounds of fish or a maximum of _ pounds of shrimp.

Casey earns $150 a week and consumes only fish and shrimp. The price of fish is $3 a pound and the price of shrimp is $5 a pound. If Casey’s income rises to $210, he could buy a maximum of _ pounds of fish or a maximum of _ pounds of shrimp.
A.70; 42
B.30; 24
C.42; 70
D.24; 30
正确答案：70; 42