It is 0.2 gallons.
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Expressed as a fraction, 20 percent is equal to 1/5 or one fifth.20% = 20/100 = 2/10 = 1/520/100 is 20 percent and that simplified is 1/520% = 20/100 which reduces to 1/5.
To calculate 20 percent of 1 billion, you would multiply 1 billion by 0.20 (which represents 20 percent as a decimal). This would result in 200 million. So, 20 percent of 1 billion is 200 million.
1/20 percent as a decimal = 0.0005(1/20)% = 0.05%0.05% = 0.05%/100% = 0.0005 in decimal
20% = 1/5
20 percent is equal to 2 over 10