An integer is a whole number that can be positive, negative, or zero. In the context of "20 minutes less," if we start with a given integer x and subtract 20 minutes from it, the result will also be an integer. For example, if x = 30, then 30 - 20 = 10, which is also an integer.
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2 + 4 + 6 + 8 = 20
The integer "-8" is less than "-7".
less than
Subtract any POSITIVE integer from -2, and you get an integer that is smaller.
42 is 16, less than 20 52 is 25, more than 20. so, 20 is not a perfect square, and does not have an integral square root. But, the square root of any integer is either an integer itself, or irrational. So, square root 20 is irrational