Min had some money. If she buys 7 chocolate bars, she will have $7 left. If she buys 9 chocolate bars, she will have $3 left.
- How much does each chocolate bar cost?
- How much money does she have?
(a)
Let 1 C be the price of 1 chocolate bar.
7 C + 7 = 9 C + 3
9 C - 7 C = 7 - 3
2 C = 4
1 C = 4 ÷ 2 = 2
Cost of each chocolate bar = $2
(b)
Total amount that Min had
= 9 x 2 + 3
= 18 + 3
= $21
Answer(s): (a) $2; (b) $21