Aptitude Day 72

Ratio and Proportion:

1. If 1/4 : 1/x = 1/x : 10/1.6, then the value of x is:

Solution:

               This is in the form of a:b::c:d

               b*c = a*d

               (1/x)*(1/x) = (1/4)*(100/16)

               1/x² = 25/16

               x² = 16/25

               x = 4/5.   

2. If 0.5 : x :: 13:6, Then the value of x is:

Solution:

                 13x = 0.5*6

                 13x = 3

                 x = 3/13.