Sam goes to swim practice for 40 minutes on Sunday and 60 minutes on most weekdays. Last week she practiced for 220 minutes. How many weekdays did she practice? You should write an equation in the form of: px + q = r to help you solve this.
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Let's assume that Sam practiced on x weekdays last week. Since she practiced for 60 minutes on most weekdays, then the total time she spent on weekdays is 60x. Additionally, she practiced for 40 minutes on Sunday, so the total time she spent on Sunday is 40.
The equation that represents the total practice time for the week is:
60x + 40 = 220
Subtracting 40 from both sides of the equation:
60x = 180
Dividing both sides of the equation by 60:
x = 3
Therefore, Sam practiced on 3 weekdays last week.
Answer: 3