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A two-digit number has digit sum 9, and reversing the digits decreases the number by 27 (so t + u = 9 and t - u = 3).
Using elimination, find the original two-digit number.

Class 10Elimination MethodAlgebra — Systems of Equations
  • A63
  • B36
  • C72
  • D54

Step-by-Step Solution

, so the number is . Check: reverse 36, and 63 - 36 = 27.
Answer: A) 63

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