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      Question

      ?2 × 25 = 42 × 21 +

      172  What value should come in place of (?) in the following questions?
      A 10 Correct Answer Incorrect Answer
      B 5 Correct Answer Incorrect Answer
      C 8 Correct Answer Incorrect Answer
      D 12 Correct Answer Incorrect Answer
      E 15 Correct Answer Incorrect Answer

      Solution

      ?2 × 25 = 42 × 21 + 172  ?2 × 25 = 16 × 21 + 289 => ?2 × 25 = 336 + 289 => ?2 × 25 = 625 => ?2 = 25 => ? = 5

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