book Maths Puzzle Numerical Ability

The volume of a spehere can be given by the formula V=4.18879rcubed

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An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air. A five-gallon tank is completely filled with a solution of 50% water and 50% alcohol. Half of the tank is drained and 2 gallons of water are added. How much water is in the resulti