X is the number of compounds which are more basic than aniline. 
o – toluedine, o-anisidine, p-anisidine, p-chloroaniline, m-toluidine

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Y is the number below compounds which are more acidic than benzoic acid.
 $C{F}_{3}COOH,CC{l}_{3}COOH,CHC{l}_{2}COOH,$ $HCOOH,FC{H}_{2}COOH,C{H}_{3}COOH,$   P-methyl benzoic acid, P-methoxy benzoic acid,  $ClC{H}_{2}COOH,PhC{H}_{2}COOH$,  m-methyl benzoic acid. Then the value of  $\frac{y\times 6-x}{6}$