logic

in a bike competition with 21 laps was observed that 13% quit before 5 laps, 17% quit later than 5 laps but less than 15, and the others 210 finished the competition the number of bikers that quit before the 5 lap were:
a) 27
b) 39
c) 43
d) 56

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asked by Jhon
  1. 13%+17% = 30% who quit
    So, 210 were the remaining 70%
    210/.7 = 300

    13% of 300 = 39

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    posted by Steve

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