155 is 31 percent of 500.
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62/100 or 31/50
6.2% as a simplified fraction is: 31/500
To dilute 500 gallons of a 31% solution to a 15% solution you would add 533.33 gallons of the dilutant. For example, if you have 500 gallons of a 31% saline solution you would add 533.33 gallons of water to create 1033.33 gallons of a 15% saline solution.
6.2% = .062 = 62/1000 = 31/500
40 percent out of 500 percent = 0.4 x 500 percent = 20 percent