Answer :

Answer:

A. 2 * 5

Step-by-step explanation:

The factors of 20 are: 1, 2, 4, 5, 10, 20

The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70

Then the greatest common factor is 10.

2 * 5 = 10

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