6. Let's say this doll costs x and this pencil costs y. I'm buying both. How much do I have to pay?
7. You had x pencils. You sold y. How many do you still have in your store?
8. I have x cruzeiros in my pocket. I want to buy this bag of marbles with it.
you're selling the bag for y. How much money will I have left?
9. x of these toy guns cost y cruzeiros. How much will you sell one of them for?
10. You’re selling each of these pencils with erasers for y. I want x of them. How much will I have to pay?