Aptitude Interview Numerical Ability Permutation and Combination

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

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Aptitude Other Question

Zegar car was in rage two years back and it costs Rs.5,60,000 then.Now,however,with many new hi-tech cars coming into the market the price of the car has dipped to Rs.4,00,000. Find the decrease in price of the car as a percentage of the old price
a.28%
b.28.57%
c.40%
d.71.42%
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.