The average of 5 numbers is 84. When a sixth number is added, the new average becomes 80. What is the sixth number?
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Worked Solution
Step 1: Find the original total of the 5 numbers.
Total = 84 × 5 = 420
Step 2: Find the new total after the sixth number is added.
New total = 80 × 6 = 480
Step 3: Find the sixth number.
480 − 420 = 60
Correct answer: 60
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