9:x::5:300 value of x

was a math problem asked on the lpn entrance exam.! graduated 27 yrs ago have no idea what the dots mean
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I interpret this to mean: find x so that 9:x is the same as 5:300, which is the same as 1:60, because 300/5=60. So x=60*9=540. Now we have 9:540::5:300, which I assume to mean 60:60 or 1:1.

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