You want to buy an 85$ case for your new phone. You make money by baking and selling pies. You earn 10$ for each pie you sell, and have saved 40$. Write and solve an inequality that represents how many more pies you need to sell to get the case.
because if you earn 10$ for each pie you sell, and have saved 40$ you need to count 3 more and the half of one you will get the money that you want i think so.