Question
The radius of the base of a cylindrical water tank is 7
m and its height is 10 m. If the tank is 60% filled, then how much more water (in cubic metres) is required to fill it completely? (Take pi = 22/7)Solution
Volume of cylinder = pi r2 h = (22/7) x 7 x 7 x 10 = 1540 cubic m Tank is 60% filled, so empty part = 40% Required water = 40% of 1540 = 616 cubic m Hence, the correct answer is 616.
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