oki
1st time = 80
2nd = 80 + 60 = 140
3rd 140 + 60 = 200
4th = 200 + 60 = 260
5th = 240 + 60 = 300
6th = 280 + 60 = 340
7th = 320 + 60 = 380
8th = 380 + 60 = 440
9th = 440 + 60 = 500
He must play 9 times to score 500 points
1.6m questions
2.0m answers