At a bookstore, Luke paid $12 for 1 colouring book and 2 textbooks. The colouring book cost $5 more than the total cost of all the textbooks.
- How much did 1 colouring book cost?
- How much did 1 textbook cost?
(a)
Cost of 2 textbooks = 1 u
Cost of 1 colouring book = 1 u + 5
Total cost of 2 textbooks and 1 colouring book
= 1 u + 1 u + 5
= 2 u + 5
2 u + 5 = 12
2 u = 12 - 5
2 u = 7
1 u = 7 ÷ 2 = 3.50
Cost of 1 colouring book
= 1 u + 5
= 3.50 + 5
= $8.50
(b)
Cost of 2 textbooks = $3.50
Cost of 1 textbook
= 3.50 ÷ 2
= $1.75
Answer(s): (a) $8.50; (b) $1.75