18 is the answer.
If you keep having problems solving problems like this you can simply draw (in this example) 6 circles and tear each of them in three pieces, there are your thirds!
Then just count them and it's done.
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You can only get one 2/3 out of a whole, since two times two thirds is four thirds which is one and a third, hence, larger than a whole.
3 thirds are in one whole
20
Oh, dude, let me break it down for you. So, 3 one thirds is basically 3/3, which simplifies to 1 whole. And since there are 6 sixths in a whole, that means there are 6 sixths in 3 one thirds. Easy peasy, lemon squeezy.
20