Lindsay practices the guitar 50 minutes on Saturday and 30 minutes on most weekdays. Last week she practiced 140 minutes. How many weekdays did she practice? Write an equation in the form px + q = r
Let's say Lindsay practiced on x weekdays last week.
On weekdays, she practiced for 30*x = 30x minutes.
Since Saturday is not a weekday, she practiced for 50 minutes on that day.
The total time she practiced on weekdays and Saturday is 30x + 50 minutes.
Since she practiced for 140 minutes last week, we can write the equation as:
30x + 50 = 140.