Sunny’s Surf Shop sold 160 surfboards this week, which was 320 percent of the number of surfboards sold last week. How many surfboards did Sunny’s Surf Shop sell last week?

Question

Sunny’s Surf Shop sold 160 surfboards this week, which was 320 percent of the number of surfboards sold last week. How many surfboards did Sunny’s Surf Shop sell last week?
16
50
160
512

GPT-4o mini · Answer

Let $ x $ be the number of surfboards sold last week. According to the problem, 320 percent of $ x $ equals the number of surfboards sold this week (160 surfboards). We can express this mathematically as: $$ 3.2x = 160 $$ To find $ x $, we will divide both sides of the equation by 3.2: $$ x = \frac{160}{3.2} $$ Calculating the right side: $$ x = 50 $$ Thus, Sunny’s Surf Shop sold **50 surfboards** last week. The answer is $ \boxed{50} $.