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"20 more than 20" means that you are adding 20 by 20. Then: 20 + 20 = 40 So 40 is 20 more than 20 because 40 - 20 = 20!
20 less than 2 times a number is 40 = 2x - 20 = 40Let x = the number2 times a number = 2x20 less than = - 20is 40: =40Translating it into mathematical symbols :2x - 20 = 40
No number is less than 20 and greater than 40, but if you switch them around, your answer is 25.
25 is the number not less than 20, not greater than 40, not divisible by 2 3 or 7, and not a prime number.
2 x 20 = 40