Answer:
1, 5
Step-by-step explanation:
The shaded area denotes the common factors of 50, 40 and 15
factors of 50 : 1, 2, 5, 10, 25, 50
factors of 40 : 1, 2, 4, 5, 8, 10, 20, 40
factors of 15 : 1, 3, 5, 15
common factors of 50, 40, 15 : 1, 5
1,5
Common factor is just 1 and 5.
