Answer:
4
Explanation:
First, list up all factors of 20, 36, and 76. Then find the greatest factor that is common in the three lists.
20: 1, 2, 4, 5, 10, 20
36: 1, 2, 3, 4, 6, 9, 12, 18, 36
76: 1, 2, 4, 19, 38, 76
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