15% decrease
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% change = 15% (decrease)% change = |original value - new value|/original value * 100%= |20 - 17|/20 * 100%= 3/20 * 100%= 0.15 * 100%= 15% (decrease)
30-24=6 6/30=0.2 0.2x100=20 20%
20% of 17 gallons= 20% * 17= 0.2 * 17= 3.4 gallons
17/85 x 100 = 20 percent.
17/20 = 85%