exam Maths Puzzle Numerical Ability

Find a counterexample to the statement �The square of a number added to the sum of the number and five is a prime number�

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exam Other Question

A 8 horsepower pump fills a tank in 8 hours. A 3 horsepower pump fills it in 12 hours. Both pumps are turned on and begin to fill the tank. After 4 hours the 8 horsepower pump breaks. How long will it take the 3 horsepower pump to finish? With the current flowing at 5 km/h, a crew rows 5 km upstream and then returns. If the total traveling time was 32 min, find the rowing rate in still water.