Write and solve a real-world problem that can be modeled by the equation 0.75x-18.50=0.65x

Diana had chocolate, and ate some, leaving 0.75 of it for Sarah.

First you need to make X = to the whole number 
So add .75x to the other side to get 1.4x the divide it by 18.5
Think of banking as a real world problem x can be tax dollars for the state the bank is located in 

Ithink the answer would be knew