The mean proportion between 5:45 is _____.

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115

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Solution

The correct option is B 15
If three numbers are in continuous proportion then the middle number is called mean proportion. So let the mean proportion between 5:45 will be x. Then
5/x= x/45
=>x²= 45*5

=> x²= 225

=> x= 15
Therefore, the mean proportion will be 15.

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