To find when the two machines will have the same amount of ice cream left, we can start by defining \( x \) as the number of days after the ice cream is sold.
For the vanilla machine:
- Initial capacity = 180 cups
- Cups sold per day = 20 cups
- Amount of ice cream left after \( x \) days = \( 180 - 20x \)
For the chocolate machine:
- Initial capacity = 140 cups
- Cups sold per day = 16 cups
- Amount of ice cream left after \( x \) days = \( 140 - 16x \)
We want to set the amount of ice cream left for both machines equal to each other:
\[ 180 - 20x = 140 - 16x \]
Now, we can solve the equation step by step:
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Rearranging terms: \[ 180 - 140 = 20x - 16x \]
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Simplifying both sides: \[ 40 = 4x \]
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Dividing both sides by 4: \[ x = 10 \]
Thus, the two machines will have the same amount of ice cream left after 10 days.
The correct equation based on our setup is: \[ 180 - 20x = 140 - 16x \] And the solution gives: \[ x = 10 \]
So the answer is: 180 - 20x = 140 - 16x; x = 10.