At a stationery shop, Rael paid $16 for 1 story book and 2 guide books. The story book cost $5 more than the total cost of all the guide books.
- How much did 1 story book cost?
- How much did 1 guide book cost?
(a)
Cost of 2 guide books = 1 u
Cost of 1 story book = 1 u + 5
Total cost of 2 guide books and 1 story book
= 1 u + 1 u + 5
= 2 u + 5
2 u + 5 = 16
2 u = 16 - 5
2 u = 11
1 u = 11 ÷ 2 = 5.50
Cost of 1 story book
= 1 u + 5
= 5.50 + 5
= $10.50
(b)
Cost of 2 guide books = $5.50
Cost of 1 guide book
= 5.50 ÷ 2
= $2.75
Answer(s): (a) $10.50; (b) $2.75