Mixture and alligation - Quantitative Aptitude - Aptitude question and answers

Explanation / Important formulas:

Alligation: It is the rule that enables us to find the ratio in which two or more ingredients at the given price must be mixed to produce a mixture of desired price.

Mean Price: The cost of a unit quantity of the mixture is called the mean price.

Rule of Alligation: If two ingredients are mixed, then:

(Quantity of cheaper/Quantity of dearer) = (C.P of dearer – Mean price/Mean price – C.P of cheaper)

We present as under:

  • C.P. of a unit quantity of cheaper (c)
  • C.P of unit quantity (d)
  • Mean price (m)
  • (Cheaper quantity) : (Dearer quantity) = (dm) : (m – c)

Suppose a container contains x of liquid from which y units are taken out and replaced by water. After n operations, the quantity of pure liquid = [x(1-y/x)n] units

More information: https://en.wikipedia.org/wiki/Alligation

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