exam Maths Puzzle Numerical Ability

Simplify:

sqrt 20 1
------- - ---------
5 sqrt 5

I do not believe that this can be simplifed, but is there a way to simplify this? Thank you for your help!!

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exam Other Question
I am having difficulty graphing the following inequality.
3x-4y<12 If the difference of a number and four is doubled, the result is 1/4 less than the number. Find the number.