Thread:Balu.ur/@comment-25501845-20141110152352/@comment-24808864-20141111001428

5) Ramu is a gardener who pulls water from an underground tank of diameter 7meter to irrigate his garden. If he pulls up 200 buckets of total water, then water level falls down 10centimeter in the tank. What is the capacity of the bucket in litre. (Note - volume of cylinder = pi * r^2 * h)

a) 10 litre.

b) 15 litre.

c) 16 litre.

d) 19 litre.

HINT: This problem is actually estimating the answer. It is close to, but not equal to, an integer. Also, there is a set of potential traps I will warn you of here.
 * 1) Trap 1: The diameter is given, not a radius. You will need to use the radius to apply the formula.
 * 2) Trap 2: The diameter is given in meters, this will need to be converted into centimeters for consistent units.
 * 3) Trap 3: The volume lifted is 200 buckets worth, you want only one bucket, you will have to divide.
 * 4) Trap 4: Another common metric conversion is that a cubic centimeter is equal to a milliliter. This allows a convenient conversion from the metric standard length measure (meter), to the standard volume measure (liter).

Being aware of these traps should allow you to get to the correct answer (which is again not exact, but an approximation). It is within a quarter liter of the correct answer.