In a stationery kiosk, 2 staplers and 3 notebooks cost $13.90. Joseph bought 3 staplers and 4 notebooks at $19.50 from the book shop.
- Find the cost of 1 stapler and 1 notebook.
- What was the cost of 1 notebook?
(a)
Let 1 stapler be 1 S.
Let 1 notebook be 1 N.
2 S + 3 N = 13.90 --- (1)
3 S + 4 N = 19.50 --- (2)
(2) - (1)
1 S + 1 N = 19.50 --- 13.90
1 S + 1 N = 5.60 --- (3)
Cost of 1 stapler and 1 notebook = $5.60
(b)
(3)
x2 2 S + 2 N = 11.20 --- (4)
(1) - (4)
1 N = 13.90 - 11.20 = $2.70
Cost of 1 notebook = $2.70
Answer(s): (a) $5.60; (b) $2.70