Let's use x as the number of milkshakes sold.
For the vanilla milkshake machine, the equation will be:
300 - 15x
For the chocolate milkshake machine, the equation will be:
280 - 20x
To find when the two machines will have the same amount of milkshakes left, we can set the two equations equal to each other:
300 - 15x = 280 - 20x
I diner makes vanilla milkshakes and chocolate milkshakes. The vanilla milkshake machine has a 300-cup capacity, and sells 15 cups per day. The chocolate milkshake machine has a 280-cup capacity, and sells 20 cups per day. Write an equation to show when the two machines will have the same amount of milkshakes left. Use x as your variable
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