At a shop, Shannon paid $50 for 1 card and 9 pens. The card cost $10 more than each pen.
- How much is 1 pen?
- How much is 1 card?
(a)
Cost of 1 pen = 1 u
Cost of 9 pens = 9 u
Cost of 1 card = 1 u + 10
Total cost of 1 card and 9 pens
= 9 u + 1 u + 10
= 10 u + 10
10 u + 10 = 50
10 u = 50 - 10
10 u = 40
1 u = 40 ÷ 10 = 4
Cost of 1 pen
= 1 u
= $4
(b)
Cost of 1 card
= 1 u + 10
= 4 + 10
= $14
Answer(s): (a) $4; (b) $14