15 hours was the restaurant opened.
What is an equation?
An equation is a mathematical statement with an 'equal to' symbol between two expressions that have equal values.
According to the question
On average, customers consume 22.75 liters of lemonade per hour the restaurant is open.
At the start of the weekend, there were 346.65 liters of lemonade in the machine. Now, there are only 5.4 liters left.
Based on the given conditions, we get the equation
346.65 - 5.4 = 22.75 × A
341.25 = 22.75A
A = [tex]\frac{341.25}{22.75}[/tex]
A = 15
Hence, 15 hours was the restaurant opened.
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