The average of 4 numbers is 15. Three of the numbers are 12, 18 and 14. What is the fourth number?
Show Worked Solution
Worked Solution
Step 1: Find the total of all 4 numbers.
Total = Average × Number of data = 15 × 4 = 60
Step 2: Add the three known numbers.
12 + 18 + 14 = 44
Step 3: Subtract to find the fourth number.
60 − 44 = 16
Answer: 16
Correct answer: 16
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