book Maths Puzzle Numerical Ability

I need a little help!!

How can I solve square root of 2 + square root of 3 - square root of 5 divided by square root of 2 + square root of 3 + square root of 5.

Thank you

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book Other Question

I cant figure out how to divide a monomial by a monomial. Im stuck on these three problems.
Numbers in < > represent exponents

(5n<5>p)<0> / (n<3>p)<2>=

3(a<2>b)4 / (3ab) Each number below is the number of miles the Hoover family has driven in a week. Determine the frequency of the class interval for this data.

142 284 557 354 315
265 329 157 3