Isaac wants to buy some notebooks of the same price. If she buys 2 notebooks, she will have $7.50 left. If she buys 4 notebooks, she will short of $1.70.
- How much does each notebook cost?
- How much does Isaac have?
(a)
Difference in the number of notebooks
= 4 - 2
= 2
Amount that Isaac needs to buy 2 notebooks
= 7.50 + 1.70
= $9.20
Cost of each notebook
= 9.20 ÷ 2
= $4.60
(b)
Amount that Isaac has
= 2 x 4.60 + 7.50
= $16.70
Answer(s): (a) $4.60; (b) $16.70