Aptitude Day 85

Ratio and Propagation:

1. X and Y together have 91. If 3/4 of X is equal to 9/2 of Y's amount. How much amount does Y have? 

Solution:
              X+Y = 91 ----- Equation 1
              3/4 X = 9/2 Y
              X = 6Y.
              From equation 1, we get
              6Y+Y = 91
              7Y = 91
              Y = 13.

2. Two numbers are respectively 30% and 70% more than the first number. The ratio of first 2 numbers is:

Solution:
              Let the ratio be a:b:c.
              a: (130/100)a: (170/100)a
              10: 13: 17.

              a = 10*13 = 130.
              b = 13*13 = 169.