There were 300 participants at an art competition. 240 participants completed their drawings in time. What percentage of the participants did not complete their drawings?

Answer 1

To find the number of participants who did not complete their drawings, subtract the number of participants who completed their drawings from the total number of participants: 300 participants - 240 participants = <<300-240=60>>60 participants
Then divide the number of participants who did not complete their drawings by the total number of participants and multiply by 100% to find the percentage: 60 participants / 300 participants * 100% = 20%. Answer: \boxed{20}.