Question

A soda costs half as much as a cupcake. Sammy purchased 3 cupcakes and 2 sodas and spent $40.00. Calculate the cost of 4 cupcakes and 5 sodas.​

Answer 1

Set up the following:

s for soda and c for cupcakes

s = 1/2(c)

3c + 2s = 40. Subtitute for the s and solve for c

3c + 2(1/2c) = 40
4c =40
c=10
s=5

So. 4c + 5s = 4(10) + 5(5) = 40+25 = 65