self Maths Puzzle undefined

The respective heights and volumes of a hemisphere and a right circular cylinder are equal, then the ratio of their radii is :

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self Other Question

Arun and Tarun can do a work in 10 days.After 4 days tarun went to his village.How many days are required to complete the remaining work by Arun alone.Arun can do the work alone in 30 days. The difference between the exterior and interior angles at a vertex of a regular polygon is 150 degree. The number of sides of the polygon is