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Number S is equal to the square of the sum of the digits of a $2$ digit number D. If the difference between S and D is $27,$ then D is

  1. $32$
  2. $54$
  3. $64$
  4. $52$
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answer is 54

as S=(5+4)^2=81
D=54

S-D= 81-54=27
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