book Maths Puzzle Numerical Ability

4. Stan and Hilda can mow the lawn in 40 minutes if they work together. If Hilda works twice as fast as Stan, how long would it take Stan to mow the lawn alone?
5. A commercial je

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prove that 1 - tan^2x = (1 - 2sin^2x)(1+tan^2x) if x > 0 then /x/ + 10 _ 0