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20% of 55= 20% * 55= 0.2 * 55= 11
55% = 55/100 = 11/20
How much water do you take out of a 55 down to be 20%
55%=55/100=11/20
The greatest common factor of the two numbers is 5. 55/5 = 11, 20/5 = 4.