Yoko had some money. If she buys 7 chocolate bars, she will have $8 left. If she buys 10 chocolate bars, she will have $2 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 + 8 = 10 C + 2
10 C - 7 C = 8 - 2
3 C = 6
1 C = 6 ÷ 3 = 2
Cost of each chocolate bar = $2
(b)
Total amount that Yoko had
= 10 x 2 + 2
= 20 + 2
= $22
Answer(s): (a) $2; (b) $22