At a shop, Irene paid $42 for 1 eraser and 5 coins. The eraser cost $6 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 + 6
Total cost of 1 eraser and 5 coins
= 5 u + 1 u + 6
= 6 u + 6
6 u + 6 = 42
6 u = 42 - 6
6 u = 36
1 u = 36 ÷ 6 = 6
Cost of 1 coin
= 1 u
= $6
(b)
Cost of 1 eraser
= 1 u + 6
= 6 + 6
= $12
Answer(s): (a) $6; (b) $12