Question

    Find the missing number.

    20, 30, 42, 56, 72, ?

    A 71 Correct Answer Incorrect Answer
    B 84 Correct Answer Incorrect Answer
    C 90 Correct Answer Incorrect Answer
    D 82 Correct Answer Incorrect Answer

    Solution

    4 x 5 = 20 5 x 6 = 30 6 x 7 = 42 7 x 8 = 56 8 x 9 = 72 9 x 10 = 90

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