gcf (greatest common factor) is usually calculated for two (or more) numbers, not for a single number.
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The pair of numbers 16 and 160 has a GCF of 16 and an LCM of 160.
16, 32 and 48
The GCF of those numbers is 4. If 20 disappeared, the GCF of the remaining numbers would be 8.
32 and 48
How about 16 and 24