Gabby had some money. If she buys 7 mini cupcakes, she will have $9 left. If she buys 9 mini cupcakes, she will have $3 left.
- How much does each mini cupcake cost?
- How much money does she have?
(a)
Let 1 M be the price of 1 mini cupcake.
7 M + 9 = 9 M + 3
9 M - 7 M = 9 - 3
2 M = 6
1 M = 6 ÷ 2 = 3
Cost of each mini cupcake = $3
(b)
Total amount that Gabby had
= 9 x 3 + 3
= 27 + 3
= $30
Answer(s): (a) $3; (b) $30