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Answer: 53.3 cm
Step-by-step explanation:
Volume of earth dug out
= 22/7*7*7*8 = 1232 cm^3
Area of embankment = Pi (R^2 - r^2)
= 22/7 * (28^2 - 7^2)
= 22/7 * 35 * 21
= 2310 m^2
Therefore
Height of embankment =
(1232/2310) * 100 cm = 53.3 cm
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