It is 10.
Think of it this way:
30=3*10=3*2*5=2*3*5
70=7*10=7*2*5=2*5*7
What they both have in common is 2 and 5.
2*5= 10
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It is one
The greatest common factor of 70 , 66 = 2
The greatest common factor of 32 , 70 = 2
10 is the greatest common factor of 130 and 70.
The Greatest Common Factor of 70, 140, 175: 35