At a shop, Marion paid $85 for 1 button and 8 coins. The button cost $4 more than each coin.
- How much is 1 coin?
- How much is 1 button?
(a)
Cost of 1 coin = 1 u
Cost of 8 coins = 8 u
Cost of 1 button = 1 u + 4
Total cost of 1 button and 8 coins
= 8 u + 1 u + 4
= 9 u + 4
9 u + 4 = 85
9 u = 85 - 4
9 u = 81
1 u = 81 ÷ 9 = 9
Cost of 1 coin
= 1 u
= $9
(b)
Cost of 1 button
= 1 u + 4
= 9 + 4
= $13
Answer(s): (a) $9; (b) $13