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It is: 21/162 = 7/54
18/54 = 1/3 by dividing the numerator and the denominator by 18
Expressed as a percentage, 54/180 x 100 = 30 percent.
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The lowest common multiple of 18 and 54 is 108. 54 times 2 equals 108, and 18 times 6 equals 108.