William wants to buy some pens of the same price. If she buys 3 pens, she will have $5.80 left. If she buys 5 pens, she will short of $2.90.
- How much does each pen cost?
- How much does William have?
(a)
Difference in the number of pens
= 5 - 3
= 2
Amount that William needs to buy 2 pens
= 5.80 + 2.90
= $8.70
Cost of each pen
= 8.70 ÷ 2
= $4.35
(b)
Amount that William has
= 3 x 4.35 + 5.80
= $18.85
Answer(s): (a) $4.35; (b) $18.85