Question

A piggy bank contains quarters and dollar bills. There is at least $18 in the piggy bank and at least 20 quarters. Which of the following systems correctly describe the possible number of quarters (q) and dollar bills (d) in the piggy bank?

Answer 1

0.25q + 1d > = 18
q > = 20

Answer 2

0.25q + d ≥ 18

q ≥ 20

Explanation:

A piggy bank contains quarters and dollar bills.

Let there be q quarters and d dollars.

There is at least $18 in the piggy bank.

i.e. 0.25q + d ≥ 18

piggy bank has at least 20 quarters.

i.e. q ≥ 20

Hence, systems which correctly describe the possible number of quarters (q) and dollar bills (d) in the piggy bank is:

0.25q + d ≥ 18

q ≥ 20