Stella wants to buy some pens of the same price. If she buys 5 pens, she will have $7.40 left. If she buys 9 pens, she will short of $1.20.
- How much does each pen cost?
- How much does Stella have?
(a)
Difference in the number of pens
= 9 - 5
= 4
Amount that Stella needs to buy 4 pens
= 7.40 + 1.20
= $8.60
Cost of each pen
= 8.60 ÷ 4
= $2.15
(b)
Amount that Stella has
= 5 x 2.15 + 7.40
= $18.15
Answer(s): (a) $2.15; (b) $18.15