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      Question

      The number of pencils with Tom and Jerry is 11 more than

      with Spike. Also, Jerry and Spike together have 9 more than Tom. If Tom and Spike together have 30 pencils, find the total number of pencils they have together.
      A 25 Correct Answer Incorrect Answer
      B 40 Correct Answer Incorrect Answer
      C 65 Correct Answer Incorrect Answer
      D 75 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let pencils with Tom = x, Jerry = y, Spike = zThen:

      x + y = z + 11 ………(1)

      y + z = x + 9 ………(2)

      x + z = 30 ………(3)

      Add (1), (2), and (3):

      β†’ 2(x + y + z) = x + z + 11 + 9 + 30 = x + z + 50

      β†’ x + z = 30

      β†’ 2(x + y + z) = 30 + 50 = 80

      β†’ x + y + z = 40

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