A type of fish for your aquarium costs $3 each. You can spend at most $21. How many of these fish can you buy? Write an inequality to model the problem. Then solve the inequality to find the number of fish.
Let f be the number of fish you can buy. Which inequality models the problem?
A.
3 f less than or equals 21
B.
3 f greater than or equals 21
C.
f plus 3 less than or equals 21
D.
f plus 3 greater than or equals 21