Question

The average of three numbers is 24. The average of two of these three numbers is $22\frac{1}{2}$. What is the value of the third number?

Answer 1

The total of three numbers is 72 $\because$ $\left(24x3\right)$

The total of two numbers is 45 $\because$ $\left(221/2x2\right)$
The third number must be 27 $\because$ $(72-45)$