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Aptitude Day 101

Ratio and Proportion:

 1. The speeds of 3 cars are in the ratio 3:5:9. The ratio between the time taken by them to travel the same distance is:

Solution:
                Speed = Distance/ Time

                The Time ratio is  1/3: 1/5: 1/9

                The required ratio is 15: 9: 5


2. In a college, the ratio of the girls and boys is 4:7. If there are 420 boys, the total number of students in the college is:

Solution:
               The Number of boys = 420.
               7x = 420
               x = 60.

               The total number of students = 4x+7x
                                                              = 11x =11(60)
                                                              = 660.
                 


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