2018 AMC 10A Problems/Problem 6
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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 0, and the score increases by 1 for each like vote and decreases by 1 for each dislike vote. At one point Sangho saw that his video had a score of 90, and that 
of the votes cast on his video were like votes. How many votes had been cast on Sangho's video at that point?
