book Maths Puzzle Numerical Ability

log(x,5)+log(5,x)=2

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book Other Question

what is is the answer to the radical expression: 4 radical 18-3 radical 32+ radical 50


i dont know how to represent radical signs
I'm having a very difficult time trying to answer this question. Here it is:
Ari Gant and Charles Pompuss took turns driving on a round trip using the same route both ways. Ari