At a store, Aaron paid $13 for 1 colouring book and 2 story books. The colouring book cost $8 more than the total cost of all the story books.
- How much did 1 colouring book cost?
- How much did 1 story book cost?
(a)
Cost of 2 story books = 1 u
Cost of 1 colouring book = 1 u + 8
Total cost of 2 story books and 1 colouring book
= 1 u + 1 u + 8
= 2 u + 8
2 u + 8 = 13
2 u = 13 - 8
2 u = 5
1 u = 5 ÷ 2 = 2.50
Cost of 1 colouring book
= 1 u + 8
= 2.50 + 8
= $10.50
(b)
Cost of 2 story books = $2.50
Cost of 1 story book
= 2.50 ÷ 2
= $1.25
Answer(s): (a) $10.50; (b) $1.25