(11+7+20+2+10)/5 = 50/5 = 10
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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
7/10 = 14/20 14/20 + 11/20 = 25/20 = 5/4
Am assuming that you mean hcf? and that would be 10, as that is the highest factor that is common in all thee numbers
2 and 20 have an HCF of 2 and an LCM of 20. You could also use 4 and 10.
The Greatest Common Factor (GCF) of 40 and 2 is 2.