30 = 0.6X
X = 50
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30 = x*60% or 30 = x*60/100
60
18 is 30% of 60
50 percent of 60 is 30.
Well, isn't that a happy little math problem we have here? To find the whole number, we can set up a simple equation: 60 equals 75 percent of the unknown number. By dividing 60 by 0.75 (which is 75 percent as a decimal), we find that the number is 80.