book Maths Puzzle Numerical Ability

A 1000 L tank now contains 240 L of water. How long will it take to fill the tank using a pump that pumps 25 L per minute?

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Solve and check the equation 9(b - 4) -7b = 5(3b - 2) You are on a pleasure cruise through the universe and you crash in the ocean of an unknown planet. Your spaceship floats on the water and its top is 39 feet above the surface of th