A closed vessel is fitted with an evacuating pump which evaluate by catching 1% of the air at each stroke and expelling it out. Find the minimum number of strokes needed to reduce the air pressure in the vessel to 90% (assume slow process)

A closed vessel is fitted with an evacuating pump which evaluate by ca

1.	A closed vessel is fitted with an evacuating pump which evaluate by catching 1% of the air at each stroke and expelling it out. Find the minimum number of strokes needed to reduce the air pressure in the vessel to 90% (assume slow process)
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