book Maths Puzzle Numerical Ability

The radius, r, of a sphere with volume V is given by the formula r = cbrt 3V / 4pi. If a sphere has a radius of 3 inches, what is its volume?

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whats the square root of 4 to the 2nd power You are making a scale drawing of a room using a scale of 1 inch:4 feet. The room is 14 feet by 18 feet. What are the dimensions of the drawing?