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Three sevenths plus six sevenths equals nine sevenths. To add fractions with the same denominator, you simply add the numerators together and keep the denominator the same. In this case, 3 + 6 = 9, so the sum is 9/7.
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.
3/7 x 4/1 = 12/7 = 1 5/7
3 / 1/7 = 3 x 7 = 21 Therefore, there are 21 sevenths in three wholes.
3/7 + 4/7 = 7/7 = 1