CAT Exam Numerical Ability Age Problem

What is x +y

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CAT Other Question
(2+x+x^2+x^3)^n = P0+P1x+P2x^2+......+P9x^9 where n,P0,P1,P2...P9 are all integers. find P1+P2+P3....+P8 Krishna Iyer, a motorist uses 24% of his fuel in covering the first 20% of his total journey (in city driving conditions). If he knows that he has to cover another 25% of his total journey in city driving conditions, what should be the minimum percentage increase in the fuel efficiency for non-city driving over the city driving fuel efficiency, so that he is just able to cover his entire journey without having to refuel? (Approximately)