There are, of course, infinitely many solutions for this. For example, the average of any of the following pairs is equal to 10:
10 and 10
9 and 11
8 and 12
0 and 20
-10 and 30
9.9 and 10.1
9.8 and 10.2
etc.
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2 and 5 2 and 10 5 and 10
Add up all the numbers together and then divide by 12 to find the average mean:- 68/12 = 17/3 or as 5 and 2/3
No, 2 and 10 are factors of 20. The LCM of 2 and 10 is 10.
2 and 20 have an HCF of 2 and an LCM of 20. You could also use 4 and 10.
An average person could commit to memory around 10-15 phone numbers.