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Number analogy: second = first x (first plus or minus a fixed number)

This type of question, asked 5 times: 19 Jul 2023 S3, 25 Jul 2023 S3, 25 Jul 2023 S4, 18 Sep 2024 S3, 23 Sep 2025 S3. All 5 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    19 Jul 2023 S3

    9
    Select the option that is related to the third term in the same way as the second term is related to the first term and the sixth term is related to the fifth term. 15 : 270 :: 21 : ? :: 18 : 378

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  2. Question 2

    25 Jul 2023 S3

    14
    Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number. 7 : 35 :: 21 : 399 :: 4 : ?

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  3. Question 3

    25 Jul 2023 S4

    6
    Select the option that is related to the third term in the same way as the second term is related to the first term and the sixth term is related to the fifth term. 16 : 144 :: 22 : ? :: 14 : 112

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  4. Question 4

    18 Sep 2024 S3

    7
    Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number. 10 : 110 :: 7 : 56 :: 9 : ? (NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding /deleting /multiplying etc., to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

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  5. Question 5

    23 Sep 2025 S3

    8
    Find the missing number: 6 : 42 :: 9 : ?

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