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Number is between  455 and 544. As it is rounded to 100s, it gives 500.

number is between  525 and 534  ,  as if it is rounded to 10s, it gives 530.

as the number has digits summing to 11.
        =>  525 to 529 not possible.
   533  is the answer.  this is between  525 and 534,  and sum of digits = 11.

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