SOLUTION: The part of a bridge pier out of water is three times the length of the part under water. If the height of the pier above water is 30 feet, what is the length of the part under wat

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Question 990391: The part of a bridge pier out of water is three times the length of the part under water. If the height of the pier above water is 30 feet, what is the length of the part under water?
Answer by ikleyn(52788) About Me  (Show Source):
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The condition says that the proportion is kept

30%2Fx = 3%2F1.

where x is unknown length of the underwater part of the pier.

Hence,

x = %2830%2A1%29%2F3 = 30%2F3 = 10 meters.