If u bring 10 empty bottles to the bottle shop, the bottle shop will change 10 empty bottles to 1 drink. If u bring 100 bottles to the shop. How many drinks will you get?"
You'll get 10 drinks. If x is the number of drinks you get, each drink requires 10 empty bottles, and you have 100 empty bottles, it would look like this:
10x = 100
You can then simply divide both sides by 10 to get 10 drinks.