20+23 = 43 and 43/2 = 21.5 which is the mean average
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23 and 29
(-18-23+20)/3= (-21)/3=-7
The smallest and largest even number in the interval are 2 and 44 and their average is (2+44)/2 = 46/2 = 23 The next smallest and largest are 4 and 42 and their average is (4+42)/2 = 46/2 = 23 and so on. Each pair has an average of 23 so the overall average is 23.
The prime numbers between 20 and 40 are: 23, 29, 31, 37, 41, 43 and 47. 23+29+31+37+41+43+47 = 251
23 is the only prime number between 20 and 29.