The radius of a circle is increased by 1%. Find how much % does its area increases?

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A typist uses a paper 30cm x 15cm.He leaves a margin at 2.5cm at the top and the bottom and 12.5cm on either side. What percentage of paper area is approximately available for typing

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A rectangular tank is 225 m by 162m at the base with what speed must water flow into it through an aperture 60cm by 45cm that the level may be raised 20cm in 5 hours?

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If the perimeter of a rectangular garden is 600 m, its length when its breadth is 100 m is________?

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