Delhi Police Constable 2008 Paper

Question : 61 of 100

Marks: +1, -0

If the digits of a number change their order on adding 18 to that number, what is the number?

Solution:

Suppose the number is

10x + y

; then

10 x+y+18=10 y+x

⇒9 x-9 y=-18

∴x-y=-2

which is possible only is option (D).

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