Question

A bakery sells a cupcake and 3 scones for $7.50. The cupcake costs twice as much as a scone. Mrs Jones bought 4 scones and 3 cupcakes and paid with a $20 bill. How much change did Mrs.Jones receive??

Answer 1

$5

Explanation:

Let c = price of 1 cupcake.

Let s = price of 1 scone.

c + 3s = 7.5

c = 2s

2s + 3s = 7.5

5s = 7.5

s = 1.5

c = 2s = 3

4s + 3c =

= 4(1.5) + 3(3) = 6 + 9 = 15

20 - 15 = 5

Answer: $5