Question

An arc contains $23$% copper. To get $69$% of copper the quantity of the arc required is:

• A. 200
• B. 250
• C. 300
• D. 400

Answer 1

The correct option is C 300

For $23\%$ of copper,

arc required $=100\%$

For $69\%$ of copper,

arc required $=(\frac{100}{23}\times 69)\%=300\%$