This is an increase of 106.7%
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19 to 31 is a 63.1579% increase.
15.5 percent = 155/1000 = 31/200
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.
31 percent of 31 = 9.6131% of 3131% *31= 31%/100% * 31= 961/100= 9.61
31 is 100 pecent. 31/100 = 0.31 is 1 percent 31/9 = 29.03 9 is 29.03 percent out of 31