At a book shop, Ellie paid $14 for 1 guide book and 2 textbooks. The guide book cost $3 more than the total cost of all the textbooks.
- How much did 1 guide book cost?
- How much did 1 textbook cost?
(a)
Cost of 2 textbooks = 1 u
Cost of 1 guide book = 1 u + 3
Total cost of 2 textbooks and 1 guide book
= 1 u + 1 u + 3
= 2 u + 3
2 u + 3 = 14
2 u = 14 - 3
2 u = 11
1 u = 11 ÷ 2 = 5.50
Cost of 1 guide book
= 1 u + 3
= 5.50 + 3
= $8.50
(b)
Cost of 2 textbooks = $5.50
Cost of 1 textbook
= 5.50 ÷ 2
= $2.75
Answer(s): (a) $8.50; (b) $2.75