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- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
Correct Answer: B
Correct Answer: B
Method / Topic: Average
The answer follows from total divided by number of values.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Average
Average = total / number of items. If the average of 4 numbers is 15, total = 4×15 = 60. The known numbers add up to 10+12+18 = 40. So x = 60-40 = 20.
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
The average of 4 numbers is 15. If the numbers are 10, 12, 18 and x, find x.
Explanation
Correct Answer: B
Method / Topic: Average
The answer follows from total divided by number of values.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Average
Average = total / number of items. If the average of 4 numbers is 15, total = 4×15 = 60. The known numbers add up to 10+12+18 = 40. So x = 60-40 = 20.
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