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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book Other Question
Write the first five terms of the follownig sequence.
a sub n = n + 1/ n with the condition: a sub n= a sub n-1 + 2, where a sub n= 1 What is 8/-3 - -7/5? I think I know what it is but I am not sure.