Aptitude Day 104

Ratio and Proportion:
                        

1. x varies inversely as square of y. Given that x=2 and y=6. The value of x for y=3 will be equal to:

Solution:

                x α 1/y²

                x =k/y²

                2 =k/(6)²

                k = 72.

              For y=3,

                  x = 72/(3)²

                    = 72/9

                  x = 8.  

A problem to solve:

If 30% of x = 90% of y, then x:y is equal to: