Isaac wants to buy some pens of the same price. If she buys 7 pens, she will have $8.70 left. If she buys 9 pens, she will have no money left.
- How much does each pen cost?
- How much does Isaac have?
(a)
Cost of 2 pens = $8.70
Cost of each pen
= 8.70 ÷ 2
= $4.35
(b)
Since Isaac will have no money left if she buys 9 pens, the amount that she has is the cost of 9 pens.
Amount that Isaac has
= 9 x 4.35
= $39.15
Answer(s): (a) $4.35; (b) $39.15