The GCF of 5 and 8 is 1.
The LCM is 40.
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The GCF is 8.
The GCF of those numbers is 4. If 20 disappeared, the GCF of the remaining numbers would be 8.
The GCF is 5.
Let the two numbers be x and y. Let suppose that the average of two numbers is 20. Then,x + y = 40 and 40/GCF = 5, where GCF = 40/5 = 8Since LCM is 48 and GCF is 8, the numbers are 16 and 24, whose average is 20 is true.
The GCF of 64 and 144 is 8.