book Maths Puzzle Numerical Ability

tanA*tanA+(1-sqrt{3})tanA-sqrt{3}=0

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A medium sized pizza is 9" in diameter and costs $6.80. A large sized pizza is 12" in diameter and costs $9.95. What is the difference in the price per square inch between a mediu It takes you 6 hours to do a job. It takes a friend 3 hours to do the same job. How long would it take both of you working together to do the job?