Each of 90 students participated in at least one of three track tryouts: high jump, long jump, and 100-meter dash. If 20 students participated in the high jump tryout, 40 students participated in the long-jump tryout, and 60 students participated in the 100-meter dash tryout, and if 5 students participated in all three tryouts, how many students participated in only two of these tryouts?
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