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 to represent this problem.(2 points)

Answer 1

Let x be the number of weekdays Lindsay practiced.
Thus, on weekdays, Lindsay practiced 30x minutes.
During the whole week, Lindsay practiced 30x + 50 minutes.
So px + q = r becomes 30x + 50 = 140. Answer: \boxed{2}.