you can findthe common factors
20 - 1, 2, 4, 5, 10 ,20
22 - 1, 2, 11, 22
38 - 1, 2, 19, 38
60 - 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
1 and 2 are the only common factors in all four numbers.
the greatest common factor is 2
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30 plus 30 equals 60 and 60 minus 38 equals 22
10x3+8=80-60+? 30+8=20+? 38=20+? 38-20=? 18=? The answer is 18.
Average = sum(X)/n = 60/3 = 20
1, 2, 19, 38 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
20-60-38