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
Correct Answer: Option B
Explanation
%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