20 of them.
9
If there are three thirds in one, there must be six thirds in two.
three thirds
Two-thirds of six is not nine. Rather, two-thirds of six is four. You can find this by realizing that two-thirds of six is the same as six-thirds of two. This equates to two times two, which is four.
Six
40
Six and two-thirds
Six and two-thirds
There are 18.
Three thirds make up a whole.
or 5 and one third