If the average of 5,6,7 and X is 10. What is the value of 'X' ?
- 12
- 22
- 32
- 42
Explanation
Average of 5, 6, 7, and X = 10
Use the average formula:
(5 + 6 + 7 + X) / 4 = 10
Add the numbers:
(18 + X) / 4 = 10
Multiply both sides by 4:
18 + X = 40
Now solve for X:
X = 40 - 18 = 22
Related MCQs
- 8
- 8.5
- 9
- None of these
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