exam Maths Puzzle Numerical Ability

how can u simplfy radicals when there are variables involved and there is a number on the outside of the square root?

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exam Other Question

I have to simplify this; sqrt20/5-1/sqrt5

I keep coming up with that this cannot be simplified, am I on the right track.
my result is
=15sqrt5/100
please help simplify the square root of 20 power 5 minus 1 power the square root of 5