AMC 10 Step by Step
2018 AMC 10AProblem 6P1-10~2 minPrint

Sangho uploaded a video to a website where viewers can vote that they like or dislike a video. Each video begins with a score of 00 , and the score increases by 11 for each like vote and decreases by 11 for each dislike vote. At one point Sangho saw that his video had a score of 9090 , and that 65%65\% of the votes cast on his video were like votes. How many votes had been cast on Sangho's video at that point?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.