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Anonymous
The GCF is 5n
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mn - 4m - 5n + 20 = (mn - 5n) - (4m - 20) = n(m - 5) - 4(m - 5) = (m -5)(n - 4)
fine
5(n - 2)
n = 70/5 n = 14
The GCF for 16 24 18 is 2.