Penelope had some money. If she buys 5 chocolate bars, she will have $7 left. If she buys 7 chocolate bars, she will have $1 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.
5 C + 7 = 7 C + 1
7 C - 5 C = 7 - 1
2 C = 6
1 C = 6 ÷ 2 = 3
Cost of each chocolate bar = $3
(b)
Total amount that Penelope had
= 7 x 3 + 1
= 21 + 1
= $22
Answer(s): (a) $3; (b) $22