Question

Demi starts a gardening project with 80 sunflower seeds. She plants 12 of the

seeds. Then she gives 5 seeds each to some friends. Which expression represents
the number of sunflower seeds Demi has left after she gives seeds to f friends?
f
5
C 80 12-5-f
A 80-12-
B 80-12-
D 80-12-5f

Answer 1

D. 80 - 12 - 5f

5f represents the 5 seeds she gives to each of her (unspecified number of) friends. 12 represents the 12 seeds she planted.
Since she is getting rid of those seeds, they are subtracted from the beginning total of 80.