If 9 is 3/7 of the entire quantity:
3
--- X = 9
7
So, via cross multiplication:
9 * 7 = 3X
63 = 3X
21 = X
The entire set is composed of 21 on units.
To check:
3
--- * 21 = 9 ; This statement is true, so 21 is correct.
7
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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.
3/5 * 15 = 9
3/7 x 21 = 9
9/3*5=15
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.