book Maths Puzzle Numerical Ability

How do I simplify and divide teh square root of 7 over the square root of 8?

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book Other Question

If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if they worked together to complete it? How would you translate phrases into algerbraic expressions?
Example: twice a number