At a store, Emma paid $15 for 1 novel and 2 guide books. The novel cost $4 more than the total cost of all the guide books.
- How much did 1 novel cost?
- How much did 1 guide book cost?
(a)
Cost of 2 guide books = 1 u
Cost of 1 novel = 1 u + 4
Total cost of 2 guide books and 1 novel
= 1 u + 1 u + 4
= 2 u + 4
2 u + 4 = 15
2 u = 15 - 4
2 u = 11
1 u = 11 ÷ 2 = 5.50
Cost of 1 novel
= 1 u + 4
= 5.50 + 4
= $9.50
(b)
Cost of 2 guide books = $5.50
Cost of 1 guide book
= 5.50 ÷ 2
= $2.75
Answer(s): (a) $9.50; (b) $2.75