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If x is subtracted from each other of 17...

If x is subtracted from each other of 17, 14, 22 and 18 then these numbers are in proportion, in this order. What is the mean proportion between 9x and 5x?

A

`3 sqrt(5)`

B

6

C

7

D

`6 sqrt(5)`

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The correct Answer is:
D
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