Question on: WAEC Mathematics - 2010
A casting is made up of Copper and Zinc. If 65% of the casting is Zinc and there are 147g of Copper. What is the mass of the casting?
A
320g
B
420g
C
520g
D
620g
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Correct Option: B
%Zinc + %Copper = 100%
65% + %Copper = 100%
%Copper = 100% - 65% = 35%
%Copper = (\frac{\text{Mass of % Copper}}{\text{Mass of Casting}}) x 100%
Mass of Casting = (\frac{147}{35}) x 100%
= 420g
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