A cylindrical gas container is closed at...

A cylindrical gas container is closed at the top and open at the bottom. If the iron plate of the top is `5/4` times as thick as the plate forming the cylindrical sides, the ratio of the radius to the height of the cylinder using minimum material for the same capacity is (a) `3/4` (b) `5/6` (c) `4/5` (d) none of these

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