At a shop, Min paid $13 for 1 eraser and 5 coins. The eraser cost $7 more than each coin.
- How much is 1 coin?
- How much is 1 eraser?
(a)
Cost of 1 coin = 1 u
Cost of 5 coins = 5 u
Cost of 1 eraser = 1 u + 7
Total cost of 1 eraser and 5 coins
= 5 u + 1 u + 7
= 6 u + 7
6 u + 7 = 13
6 u = 13 - 7
6 u = 6
1 u = 6 ÷ 6 = 1
Cost of 1 coin
= 1 u
= $1
(b)
Cost of 1 eraser
= 1 u + 7
= 1 + 7
= $8
Answer(s): (a) $1; (b) $8