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    Question

    What value should come in place of (?) in the following questions?

    ?2 × 25 = 42 × 21 +

    172 
    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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