book Maths Puzzle Numerical Ability

On a flight to San Francisco, the pilot announced that he was 139 miles from the city, flying at an altitude of 35,000 feet. The pilot claimed that he could see the Golden Gate Bri

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If f(x) = x2 + 5, find f(a + h) − f(a) : It takes Steven 8 hours to clean the yard and mow the lawn. He and his brother Daniel can do the same job in 3 hours when they work together. How long does it take Daniel to d