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Conversion of solids (advanced)

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Problem

A well of diameter 4, start text, c, m, end text is dug 20, start text, c, m, end text deep. The mud taken out is spread evenly around the well to form a 16, start text, c, m, end text high start color #a75a05, start text, e, m, b, a, n, k, m, e, n, t, end text, end color #a75a05.
FInd the thickness of the embankment.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
start text, c, m, end text
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