The GCF is 10.
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The GCF of 20 40 and 50 is 10.
10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
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The GCF of 40, 50, and 75 is 5.
20/50 = 40/100 = 40%