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    Question

    Some equations have been solved on the basis of certain

    system. Find the correct answer for the unsolved equations on that basis: If 82 × 24 = 24, 12 × 31 = 5 and 15 × 36 = 23 then 42 × 18 =?
    A 12 Correct Answer Incorrect Answer
    B 16 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 18 Correct Answer Incorrect Answer

    Solution

    82 × 24 = (8 × 2) + (2 ×4) = 16 + 8 = 24 12 × 31 = (1 × 2) + (3 × 1) = 2 + 3 = 5 15 × 36 = (1 × 5) + (3 × 6) = 5 + 18 = 23 42 × 18 = (4 × 2) + (1 × 8) = 8 + 8 = 16

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