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      Question

      The ratio of three numbers is

      7:2:5, and their squared values add up to 1248. Identify the largest number among them.
      A 42 Correct Answer Incorrect Answer
      B 32 Correct Answer Incorrect Answer
      C 28 Correct Answer Incorrect Answer
      D 18 Correct Answer Incorrect Answer

      Solution

      ATQ, Let the numbers be โ€˜7pโ€™, โ€˜2pโ€™ and โ€˜5pโ€™ respectively. So, 49p2 + 4p2 + 25p2 = 1248 Or, 78p2 = 1248 Or, p2 = 16 Or, p = 4 So, largest number = 7p = 7 ร— 4 = 28

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