book Maths Puzzle Numerical Ability

Id any intercepts and asymptotes of the following:

f(x) = 2x-1/x-5

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book Other Question

by selling 45 oranges for rs. 80. a man loses 20%. how many should he sell for rs. 48, so as to gain 20% in the transaction? I have to solve 3/4=c/20 and say if its a identity or if it has no solution