One third of 63 = 21
a third of 21 is 7
7
7 is one third of 21. Then, you would have 14 left behind because 7 times 3 is 21 and 7+7+7=21.
33.3% of 21 = 33.3% * 21 = 0.333 * 21 = 6.993
21. (7x3=21)
1/7 + 1/3 = 3/21 + 7/21 = 10/21
1/3 - 1/7 = 7/21 - 3/21 = 4/21.
7
That is 21.
4/21
2/21