At a book shop, Julian paid $14 for 1 textbook and 2 guide books. The textbook cost $7 more than the total cost of all the guide books.
- How much did 1 textbook cost?
- How much did 1 guide book cost?
(a)
Cost of 2 guide books = 1 u
Cost of 1 textbook = 1 u + 7
Total cost of 2 guide books and 1 textbook
= 1 u + 1 u + 7
= 2 u + 7
2 u + 7 = 14
2 u = 14 - 7
2 u = 7
1 u = 7 ÷ 2 = 3.50
Cost of 1 textbook
= 1 u + 7
= 3.50 + 7
= $10.50
(b)
Cost of 2 guide books = $3.50
Cost of 1 guide book
= 3.50 ÷ 2
= $1.75
Answer(s): (a) $10.50; (b) $1.75