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With a bit of imagination, anything is possible. I tried it myself for two seconds before looking it up.

I found the answer on page 192 in The Canterbury Puzzles and Other Curious Problems.

You not only arrange three nines, but you also introduce a bit of mathematical notation (a plus sign, a ratio, and a decimal point).

The answer is (9+9)/.9

In adding 9 and 9 you get 18. You then divide it by .9 (or 9/10).

18/(9/10) = (18*10)/9 = 180/9 or 2*10 = 20

Or you could just pop it into a calculator and get 20 that way.

When I first saw the question, I thought you wanted the numbers to look like '20'.

With a bit of imagination, anything is possible. After all, 9+9=21.

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Q: How can three nines be arranged to make twenty?
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