Two or more numbers are needed to find the average then you add them up then divide them by how many there are as for example the average of 2+4+6 = 12 and so 12/3 = 4 which is the mean average
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The average is 54.
42
A quarter of 42 is 10.5 You can find this by dividing 42 by four.
Th LCM of 21 and 42 is: 42
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.