We will model the situation with an equation, first lets stablish the value that we need to find: We need to find the quantity of bricks that Mr. Civitello can buy with $200, lets call this value B, but the say to us that he will not only need the bricks, he also need a bag of mortar which costs $6, then we put this information in a equation
so he can use 97 bricks to build the wall.