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A conical tent was erected by army at a ...

A conical tent was erected by army at a base camp with height 3m. and base diameter 8m. Find,
(i) The cost of canvas required for making the tent, if the canvas cost rupees 70 per 1 sq.m.
for every person requires 3.5`m^(3) ` air how many can be seated in that tent

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