Which of the following would represent this situation

Question

A client at a local health club may purchase healthy beverages and are billed once a month. Two friends want to compare the price of a particular smoothie based on their monthly bill. the first friend got a $1 reduction on each of the 9 smoothies they bought but their bill was the same as the second friend who bought one of the smoothies and $15 of other drinks. Which of the following would represent this situation

 

A. X-9=X+15

B. 9(X+1)= 15X

C. 9X-1=X+ 15

D. 9(X-1)=X + 15

 

I dont understand word problems such as these so a helpful breakdown of how you understand would be greatly appreciated.

Answer 1

The hardest part is to Let X represent the price of the smoothie.

 

"the first friend got a $1 reduction on each of the 9 smoothies they bought"

                                                       9(X-1)    

 

 

but their bill was the same as the second friend who bought

                                        =

 

one of the smoothies and $15 of other drinks

                            X+15