Question

Heather sees that two stores have similar sales. store a says that 5 balloons will cost her $6.00 and store b says that 13 balloons will cost her $16.25. if she is planning on buying 27 balloons and wants to spend as little money as possible, which store should she buy from and how much would it cost her?

Answer 1

Do proportions for both
5/6= 27/x
Cross multiply and divide
27 x 6 divided by 5 is $32.4
Next proportion:
13/16.25= 27/x
Cross multiply and divide
27 x 16.25 divided by 13= $33.75

So your answer store A with a cost of $32.4