Question 292554
So the relation of the first volume to the second is that the second is 125 times greater. 

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The other tutor worked it correctly.  The ratio is 125.
But, it's 125 times AS great, not 125 times greater.
125 times greater is 126 times as great.
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If you disagree:

How much is 1 times greater?
How much is 100% greater?