It is 50%.
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24am - 9an + 40bm - 15bn = 3a*(8m - 3n) + 5b*(8m - 3n) = (3a + 5b)*(8m - 3n)
No because 4m = 400cm.
The GCF is 8. 8(m + n)
mn - 4m - 5n + 20 = (mn - 5n) - (4m - 20) = n(m - 5) - 4(m - 5) = (m -5)(n - 4)
No because 4m equals 400 cm which is less than 450 cm