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Mathematical Puzzles Medium 2 min

The average of five numbers is 24. Four of the numbers are 18, 22, 25 and 31. What is the fifth number?

Hint
First calculate the required total.

Answer

24.

Explanation

The total of five numbers must be 120. The four known numbers total 96, leaving 24.

Step-by-Step Solution

Required total = 5 × 24 = 120.
Known total = 18 + 22 + 25 + 31 = 96.
Missing number = 120 - 96 = 24.
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