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      Question

      A number exceeds 45 times its reciprocal by 5/6. Find

      the number.
      A 5 Correct Answer Incorrect Answer
      B 10 Correct Answer Incorrect Answer
      C 12 Correct Answer Incorrect Answer
      D 18 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the number be x.

      x – 45/x = 5/6

      β‡’ (xΒ² – 45)/x = 5/6

      Cross-multiplying:

      6xΒ² – 270 = 5x

      β‡’ 6xΒ² – 5x – 270 = 0

      Factorizing:

      6xΒ² – 30x + 25x – 270 = 0

      6x(x – 5) + 27(x – 5) = 0

      (6x + 27)(x – 10) = 0

      So, x = –9/2 or x = 10

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