14/18, 21/27, 28/36, 35/45
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Seven ninths minus four ninths is 1/3.
12 is four ninths of twenty-seven.
When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.
It is seven ninths.
LCD of 9 and 5 = 45 so equivalent fractions are 25/45 and 36/45. The latter is clearly the larger ie four fifths