Question : If the numerical value of twice the curved surface area of a right circular cylinder is equal to the numerical value of its volume, then what is the numerical value of the radius of the base of the cylinder?
Option 1: 2
Option 2: 3
Option 3: 5
Option 4: 4
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Correct Answer: 4
Solution :
According to the question,
$2\pi rh \times 2= \pi r^2h$
⇒ $4 = r$
⇒ $r = 4\ \mathrm{units}$
Hence, the correct answer is 4.
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