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p% of one quantity equals q% of another (or of a sum/difference): one as a percent of the other

This type of question, asked 2 times: 3 Feb 2022 Tier II, 7 Mar 2023 Tier II. All 2 questions below, oldest first.

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  1. Question 1

    3 Feb 2022 Tier II

    16
    If 91% of A is 39% of B, and B is x% of A, then the value of x is:

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  2. Question 2

    7 Mar 2023 Tier II

    24
    If 20% of (A + B) = 30% of (A −- B), then what percentage of B is equal to A?

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