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Q.

If x+y=6543298 and x11y5 is maximum then the ratio of the numbers is

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a

11 : 5

b

3 : 13

c

14 : 2

d

12 : 4

answer is D.

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Detailed Solution

x+y=6543298 let k=654398 x+y=ky=k-x S=x11y5=x11k-x5 logS=11logx+5logk-x S1S=11x-5k-x

S is min or max 

SI=0 11x-5k-x=0 11k-11x-5x=0 x=11k16 y=k-x =k-11k16 =5k16 x:y=11k16:5k16 =11:5

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