Answer :
Find the factors of 20 and 35.
20:
1, 2, 4, 5, 10, 20
35:
1, 5, 7, 35
1 and 5 are both factors of 20 and 35.
20:
1, 2, 4, 5, 10, 20
35:
1, 5, 7, 35
1 and 5 are both factors of 20 and 35.