The average of 2 numbers is ab. If one of the number is a, the other is:
Given, Average of two numbers = ab
One number is a.
Let the other number be x.
$$\dfrac{a+x}{2} = ab$$
=> $$a+x = 2ab$$
=> $$x = 2ab-a$$
Therefore, The other number is 2ab-a.
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