Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: · Marks: · Difficulty:
A right cylindrical vessel is full of water. How many right cones having the same radius and height as those of the right cylinder will be needed to store that water?
(a)2
(b)3
(c)4
(d)8
Answer
Answer (as printed): B
Explanation
Let radius of each be $r$ and height of each be $h$. Then, number of cones needed $$=\frac{\text { Volume of cylinder }}{\text { Volume of } 1 \text { cone }}=\frac{\pi r^{2} h}{\frac{1}{3} \pi r^{2} h}=3 .$$
Explanation as extracted from the printed page; notation may be imperfect.