The difference between two numbers are
and numbers are
and
so the equation is 
How to find the equation and what is the equation ?
equation, statement of equality between two expressions consisting of variables and/or numbers. In essence, equations are questions, and the development of mathematics has been driven by attempts to find answers to those questions in a systematic way.
if the difference of two numbers are 
And one number is
and another is 
So we write the equation with operation of subtraction

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The list of numbers from least to greatest is
3/10 , 3/7, 3/6
This is because the numerator stays the same across all three of these fractions. However, the denominator is changing, and this proves to be a large difference.
Think about it this way: If you cut a pie into ten pieces, then those slices are going to be smaller than if you cut the pie into seven or six pieces.
50 = 2 x 25 = 2 x 5 x 5 = 2 x 5^2
20 = 2 x 10 = 2 x 2 x 5 = 2^2 x 5