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What is x in an equation of percentages of numbers

The same question, asked 2 times: 17 Jul 2023 S1*, 19 Jul 2023 S3. Every wording 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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