exam Maths Puzzle Numerical Ability

A worker can cover a parking lot with asphalt in ten hours. With the help of an assistant, they can do the job in six hours. How long would it take the assistant working alone to cover the parking lot with asphalt?

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Earthquake Intensity: On June 16, 1999, the city of Puebla in central Mexico was shaken by an earthquake that measured 6.7 on the Richter scale. Express this reading in terms of I0 How many ounces of pure gold must be added to five ounces of something that is 1 % gold in order that the mixture is 6 % gold?