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140 is an integer: it is neither a fraction nor a mixed number and so it makes no sense to write it as one. However, if you must, you could write it is 140/1.
I suppose you could write it as 20 and 4/4, but that doesn't make a lot of sense. In general, whole numbers and mixed numbers are separate things.
Infinity is not a number in the ordinary sense of the word.
common sense
Answer: Mixed number Answer: It is neither, in the sense that you can't write the square root of any positive integer (except for the square root of perfect squares) exactly as a fraction. You can only approximate it. In other words, it's an irrational number.