Question 12

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waecmaths question: 

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?

Option A: 

320g

Option B: 

420g

Option C: 

520g

Option D: 

620g

waecmaths solution: 

$\begin{align}  & \text{Percentage of copper}=(100-65)percent=35percent \\ & 35\text{percent}\to 147g \\ & 65percent\text{ }\to \frac{65}{35}\times 147=273g \\ & \text{Mass of the casting }=147g+273g=420g \\\end{align}$

maths year: