21
One third divided by seven = 1/21
21 x (1/3) = 21/3 = 7
7/21 + 3/21 = 1021
5/7 + 1/3 = 15/21 + 7/21 = 22/21 = 1 1/21
12/21 - 7/21 = 5/21
1/3 of 21 = 71/3 of 21 = 71/3 of 21 = 71/3 of 21 = 7
1/7 + 1/3 = 3/21 + 7/21 = 10/21
1/3 - 1/7 = 7/21 - 3/21 = 4/21.
21 and 1/3
7 counters.
It is 10/21.