Aptitude Interview Numerical Ability

In 2008 Olympics held at Beijing, Japan won 45 medals in atheletics, 15 in Judo and 28 in swimming/These medals were bagged by a total of 68 people and only three of them got medals in all the three events. Find the number of sports persons who received medals in exactly one event if there were 14 sports persons who had received medals in exactly two events.

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Aptitude Other Question
There are 3 main steps of completion of a project-Development,Review and Roll out.After development, there are 4 people who can independently work and lead the process to the next step. i.e.Review.Further ahead,there are 5 people who can work independently and lead the process to the next atep i.e.Roll-out.In how many ways can a project manager complete the project?
a.20
b.9
c.16
d.25
e.18 how to find 100!?