Aptitude – Chain Rules – Notes For W.B.C.S. Examination.
Rule of three
The method of finding the 4th proportional when the other three are given is called Simple Proportional or Rule of three.Continue Reading Aptitude – Chain Rules – Notes For W.B.C.S. Examination.
Repeated use of three is called Compound Proportional.
Two quantities are said to vary directly if on the increase ( or decrease) of the one , the other increase (or decrease) to the same extent.
- More articles , more cost.
- More men, more work.
Two quantities are said to vary indirectly if on the increase ( or decrease) of the one , the other decrease (or increase ) to the same extent.
- Less time to finish a work , more persons at work.
- More speed , less is the time taken.
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