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Radius of a planet with the same g as the earth but a different density

The same question, asked 2 times: 11 May 2023 S1*, 15 May 2023 S2. Every wording below, oldest first.

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  1. Question 1

    11 May 2023 S1

    5
    The acceleration due to gravity at the surface of the planet is same as that at the surface of the earth, but the density of planet is thrice that of the earth. If 'R' is the radius of the earth, the radius of the planet will be

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  2. Question 2

    15 May 2023 S2

    47
    The density of a new planet is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of earth. If RR is the radius of earth, then radius of the planet would be

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