Question

There are 13 fish in an aquarium. Seven of the fish are guppies. How many

non-guppies are in the aquarium?
A. the number of guppies
B. the total number of fish
C. the number of non-guppies
( what is the variable in the problem?)

Answer 1

6 non-guppies; C. the number of non-guppies

Explanation:

13-7=x

(x is the number of non-guppies)

13-7=6