The average of 6 numbers is 14. When a 7th number is added, the new average becomes 15. What is the 7th number?
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Worked Solution
Step 1: Find the total of the original 6 numbers.
Total = 14 × 6 = 84.
Step 2: Find the new total after adding the 7th number.
New total = 15 × 7 = 105.
Step 3: Find the 7th number.
7th number = 105 − 84 = 21.
Answer: The 7th number is 21.
Correct answer: 21
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