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Evaluate or solve an expression in percentages of numbers

This type of question, asked 6 times: 17 Jul 2023 S1, 19 Jul 2023 S3, 26 Jul 2023 S1, 12 Sep 2025 S3, 15 Sep 2025 S2, 15 Sep 2025 S3. All 6 questions below, oldest first.

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  1. Question 1

    17 Jul 2023 S1

    71
    If x% of 280 = 15% of 240 + 20% of 310, then the value of x is:

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  2. Question 2

    19 Jul 2023 S3

    73
    If 65%65\% of 350 −- ?%\% of 250 + 40%40\% of 120 = 158, then find the value of ?

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  3. Question 3

    26 Jul 2023 S1

    70
    Which of the following is the least? 12%12\% of 625 15%15\% of 555 10%10\% of 720 9%9\% of 845

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  4. Question 4

    12 Sep 2025 S3

    61
    Evaluate: 12(12)%12\left(\frac{1}{2}\right)\% of 560 km + 66(23)%66\left(\frac{2}{3}\right)\% of 240 km

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  5. Question 5

    15 Sep 2025 S2

    57
    Evaluate: 80% of 350−37(12)% of 160+11% of 50080\% \text{ of } 350 - 37\left(\frac{1}{2}\right)\% \text{ of } 160 + 11\% \text{ of } 500

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  6. Question 6

    15 Sep 2025 S3

    75
    2.5%2.5\% of 200200 = ?

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