A casting is made up of Copper and Zinc. If 65% of the ca...
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?
320g
420g
520g
620g
Correct answer is B
%Zinc + %Copper = 100%
65% + %Copper = 100%
%Copper = 100% - 65% = 35%
%Copper = Mass of % CopperMass of Casting x 100%
Mass of Casting = 14735 x 100%
= 420g
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