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A cylindrical water tank has a base radius of 7 m and a height of 10 m. Water is filled into the tank at a constant rate. After filling the tank compl
Question

A cylindrical water tank has a base radius of 7 m and a height of 10 m. Water is filled into the tank at a constant rate. After filling the tank completely, 5% of the water leaks out due to a crack at the bottom. The remaining water is transferred into another cylindrical tank whose base radius is 5 m. Find the height of water in the second tank.

A.

16.82 m

B.

18.26 m

C.

18.62 m

D.

12.68 m

Correct option is C

Given
Tank 1: radius = 7 m, height = 10 m
Water leakage = 5%
Tank 2: radius = 5 m
Formula Used
Volume of cylinder = πr2h\pi r^2 h​​
Solution
Initial Volume of Tank 1 =π×72×10=490π \pi \times 7^2 \times 10 = 490\pi​​
Water remaining after 5% leak = 95%of490π95\% of 490\pi​​
Remaining Volume = 0.95×490π=465.5π0.95 \times 490\pi = 465.5\pi​​
Let the height of water in the second tank be h.
Volume of water in Tank 2 =π×52×h=465.5π \pi \times 5^2 \times h = 465.5\pi​​
25h=465.525h = 465.5​​
h =465.525=18.62 \frac{465.5}{25} = 18.62​ m
Final Answer
So the correct answer is (c)

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