1/2 x 3/7 = 3/14
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3/7 x 4/1 = 12/7 = 1 5/7
nine eighteenths is one half. Half of 6/7 must be 3/7
5/7 - 1/2 = 10/14 - 7/14 = 3/14
A seventh is, in common math, 1 divided by 7. As this show, a full 7 sevenths would equate to 1. Thus, we can conclude that there is no way that 3 sevenths can be 9, as it is less than 7 sevenths.
3 / 1/7 = 3 x 7 = 21 Therefore, there are 21 sevenths in three wholes.