If x is the average of k and 15, and y is the average of k and 5, what is the average of x and y in terms of k?
- k+10/2
- k+7
- k+14
- 10k
Explanation
x = average of k and 15 = (k + 15) / 2
y = average of k and 5 = (k + 5) / 2
Average of x and y = (x + y) / 2
= [ (k + 15)/2 + (k + 5)/2 ] / 2
= [ (k + 15 + k + 5) / 2 ] / 2
= (2k + 20) / 4
= (k + 10) / 2
Related MCQs
- 2x² + 4 = 9x
- 2x² + 9 = 4x
- 2x² + 9 = 4x
- x² + 4 = 9x
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