Given that:
1 bottle of drink + 1 bottle of drink + 1 bottle of drink = 30
1 bottle of drink + 1 cheeseburger + 1 cheeseburger = 20
1 cheeseburger + 2 glasses of drink + 2 glasses of drink = 9
Try to find the answer to this:
1 cheeseburger + 1 glass of drink × 1 bottle of drink = ?
