12
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18 is.
The only two prime factors of 18 are: 2, 3
12 divided by two over three is the same as twelve multiplied by three over two so the answer is 18.
"Two thirds" of anything means: Cut it into three equal pieces, and then take two of them. You can do exactly that with the number ' 18 '. That's how.
18/8 - 11/8 = 7/8