At a shop, Tiffany paid $45 for 1 eraser and 9 buttons. The eraser cost $5 more than each button.
- How much is 1 button?
- How much is 1 eraser?
(a)
Cost of 1 button = 1 u
Cost of 9 buttons = 9 u
Cost of 1 eraser = 1 u + 5
Total cost of 1 eraser and 9 buttons
= 9 u + 1 u + 5
= 10 u + 5
10 u + 5 = 45
10 u = 45 - 5
10 u = 40
1 u = 40 ÷ 10 = 4
Cost of 1 button
= 1 u
= $4
(b)
Cost of 1 eraser
= 1 u + 5
= 4 + 5
= $9
Answer(s): (a) $4; (b) $9