Formula formation we use alphabets like x, y, z etc., to denote variables.
For example the length of a rectangle is denoted by 'l'. It takes different values in different rectangles.
A formula is a relation between different variables formed using mathematical symbols. Any given condition can be translated into a formula using variables and mathematical symbols.
Volume of a cuboid is the product of length, breadth and height.
This is written as V = l x b x h.
We say that this is the formula for the volume of the cuboid.
Formula
A formula is formed by using:
(a) mathematical symbols and variables (b) given conditions, and (c) simplification.
Change of subject of formula:
In the formula 
I is called the subject of the formula.
To make 'P' the subject of the formula:
P x T x R = 100 x I
Algebra Mixture Problems:
Mixture problems are the types of words problems where the values of different quantities are mixed. The procedure to solve the mixture problem is shown with an example.
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