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Solid cylinder drilled through by full-height holes: percent of volume removed

The same question, asked 2 times: 13 Sep 2025 S3*, 14 Sep 2025 S2. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    13 Sep 2025 S3

    74
    A solid cylinder radius 55 cm is drilled by four cylindrical holes each radius 11 cm length equal to the full height. Volume removed is approximately what percent?

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  2. Question 2

    14 Sep 2025 S2

    74
    A cylinder (r = 4 cm, h = 10 cm) is bored through by a hole (r = 2 cm, full height). What percentage of original volume is removed?

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