exam Maths Puzzle Numerical Ability

2+3i/i

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8. Alexandra and Frank can assemble a swing set working together in 6 hours. One day, when Frank called in sick, Alexandra was able to assemble a swing set in 10 hours. How long would it take Frank to assemble a swing set if he worked by himself? What is the approximate surface area of the observatory if the radius is 10 ft and its altitude measures 24 ft