Answers

2014-12-13T09:57:29+05:30
Factorising 20 and 30 we have 
   Factors of 20 = 1 , 2 , 4 , 5 , 10 , 20.    
   Factors of 30 = 1 , 2 , 3 , 5 , 10 , 15 , 30. 
   Common factors of 20 and 30 = 1, 2 , 5 , 10
The greatest common factor of 20 and 30 is 10.
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2014-12-13T10:03:16+05:30
10 is the ans
20 = 1,2,4,5,10
30 = 1,2,3,5,10,15
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