book Maths Puzzle Numerical Ability

i=sqrt(p/r) if p=500 ,r=25. would that make the answer 20 ?

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hellow i dont realy lick doin algebra because it is to hard i tryed finding some help but i couldnt i looked on different sites but they said you have to download but my parents wo Simplifying Rational Expression

x^2 - 3x - 10/x^2 - x - 20