The GCF is 5.
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The Greatest Common Factor of 14, 35, 42 is 7.
Since 20 is a factor of 40, it is automatically the GCF.
The LCM and GCF of 40 and 20 are 40 and 20 respectively.
The GCF of 7, 20, and 35 is 1.
The GCF of these numbers is 40.