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Q3. (a) A white metal for bearings is composed of eleven parts tin, two parts antimony and one - part copper by mass. Determine the masses of antimony and copper required to combine with 220 kg of tin to make white metal. (10)

b) Factorise fully EACH of the following:

i) 3ac + 2ad - 6bc - 4bd (3)

ii)x⁴ y - 4x² y³ (3)

iii)2y³ - 5y² + 18y - 45 (3)