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      Question

      Sum of three positive numbers is 120. If the ratio of

      the first and second number is 5:7, respectively while difference between the first and third number is equal to the second number, then find the third number. 
      A 58 Correct Answer Incorrect Answer
      B 28 Correct Answer Incorrect Answer
      C 37 Correct Answer Incorrect Answer
      D 60 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the first number be '5x' So, second number = 5x X (7/5) = '7x' And, third number = 5x + 7x = '12x' ATQ: 5x + 7x + 12x = 120 Or, 24x = 120 So, x = 5 So, third number = 12 X 5 = 60

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