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    Select the number from among the given options that can replace the question mark (?) in the following analogy. 56 : 15 :: 76 : 21 :: 81 : ?
    Question

    Select the number from among the given options that can replace the question mark (?) in the following analogy.
    56 : 15 :: 76 : 21 :: 81 : ?

    A.

    4

    B.

    10

    C.

    36

    D.

    21

    Correct option is A

    Given:
    56 : 15 :: 76 : 21 :: 81 : ?
    Logic: (1st digit × 2nd digit) ÷ 2
    we see that 56: 15
    = (5 × 6) ÷ 2 = 30 ÷ 2 = 15​
    again 76: 21
    = (7 × 6) ÷ 2 = 42 ÷ 2 = 21​
    81:?
    = (8 × 1) ÷ 2 = 8 ÷ 2 = 4
    Thus, the correct answer is (a).

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