nikhil007 wrote:

I got the point..but i just want to know what was wrong with my logic..??

5<x<10; max x =9

10<2x<20;max 2x =19(not 9*2=18)==> x=9.5

20<4x<40;max 4x=39 (not 19*2=38)==> x=19.5

Since this an inequality, we can take the value of x directly for y=x+5 .

find the value of x+y means he is asking you to find:

x+y=(max value of 2x)+5.

The max value of 2x is 19 ...not 18 ...

_________________

Regards,

Rajesh

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