900
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x2 - 19x + 60 = x2 - 15x - 4x + 60 = x(x - 15) - 4(x - 15) = (x - 15)(x - 4)
0.25 X 60 = 15.
((75/100) x 80) + ((15/100) x 60) = 60 + 9 = 69
Expressed as a percentage, 15/60 x 100 = 25 percent.
60 units (4 sides x 15 = 60)