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Aptitude Day 67


Answers of Day 66:
          1. 30.
          2. 15.

Ratio And Proportion: 

 Basics:

a:b::c:d is equivalent to b*c = a*d

a:b = c:d 
Here the fourth proportional is d.

 a:b = b:c
Here the third proportional is c.

Mean proportional between a and b is (ab)1/2 

The Duplicate ratio of (a:b) is a2:b2

The Sub-duplicate ratio of (a:b) is a1/2:b1/2  

The Triplicate ratio of (a:b) is a3:b3 

 The Sub-duplicate ratio of (a:b) is a1/3:b1/3  









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