question from exam decoded section.

Asked by avadha | 21st May, 2010, 01:46: PM

Expert Answer:

let the tens place of the number be x and the units place be y.

 so the numer is

10x+y

so the number otained by intechanging the digits is

10y+x

ATQ,

7[10x+y]=4[10y+x]

so we get,

66x-33y=0

or

2x=y

Answered by  | 21st May, 2010, 02:07: PM

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