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27 out of 30 is 90%
27 is 90% of 30.
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The factors of 27 from 1-30 are: 1, 3, 9, 27.
Let x be the fraction you seek. x + 2/3 = 9/10 Find common denominator: x + 20/30 = 27/30 x = 7/30 Check: 7/30 + 20/30 = 27/30 27/30 = 27/30