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A 20 m deep well with diameter 7 m is du...

A 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form a platform 22 m by 14 m. Find the height of the platform.

A

2.5 m

B

3.5 m

C

5 m

D

7 m

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A
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