We will use division operator to solve this word problem. Division operator is used when the problem asks for 'one,' 'each,' or 'per'.
Total amount to buy CDs for friends party = $90
Cost of each CD = $18
The possible numbers of CDs that can be bought is calculated by dividing $90 by $18.
= [tex] \$ 90 \div \$18 [/tex]
= [tex] \frac{90}{18} [/tex]
= 5 CDs
