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A more formal definition for a number less than 20 could be, "a number x, x < 20" or if you want to express the set of all numbers less than 20 "{x | x < 20}" which is read "the set of all numbers x such that x is less than 20". In interval notation, you can write (-infinity, 20) where "infinity" should be replaced by the infinity symbol.
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How do you get 20 percent less of a number?
If you multiply a number by 0.8, the result is 20% less than the original number.
What is a prime number that is greater than 20 but less than 29?
The prime number that is greater than 20 but less than 29 is 23.
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300+20+8 is 10 less than what number
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What is four less than a number and three?
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