# What's the other number if the average of 63 and one other number is 33.

What's the other number if the average of 63 and one other number is 33.
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Tristin Durham
The average of two numbers is the sum of the two numbers, divided by 2. Like this:
$\frac{{x}_{1}+{x}_{2}}{2}=avg$
We are given ${x}_{1}$,avg and are asked to find ${x}_{2}$:
$\frac{63+{x}_{2}}{2}=33$
$\left(63+{x}_{2}\right)=66$
${x}_{2}=3$