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    • Question

      The sides of a triangle are in the ratio 5:7:12, and its

      perimeter is 144 cm. What is the difference in length between the longest and the shortest side?
      A 28 cm Correct Answer Incorrect Answer
      B 30 cm Correct Answer Incorrect Answer
      C 42 cm Correct Answer Incorrect Answer
      D 56 cm Correct Answer Incorrect Answer

      Solution

      Let the length of sides of triangle be '5a' cm, '7a' cm and '12a' cm.

      Perimeter of triangle = sum of the length of each sides of triangle

      5a + 7a + 12a = 144

      Or, 24a = 144

      So, 'a' = 6 cm

      So, largest side = 12a = 12 X 6 = 72 cm

      And, smallest side = 5a = 5 X 6 = 30 cm

      Required difference = 72 - 30 = 42 cm

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