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A cement bridge post is 24 inches square and 15 feet 9 inches in length. If the cement weighs 145 pounds per cubic foot, how much does one bridge post weigh?

A. 9,280 pounds
B. 9,222 pounds
C. 9,135 pounds
D. 8,700 pounds

Answer :

To find the weight of a cement bridge post, calculate its volume and multiply by the density of cement. The weight of one bridge post is 9,135 pounds.

The volume of the cement bridge post is calculated as follows:

  1. Convert the dimensions to feet: 24 inches square is 2 feet by 2 feet, and 15 feet 9 inches is 15.75 feet.
  2. Calculate the volume: V = length x width x height = 2 ft x 2 ft x 15.75 ft = 63 cubic feet.
  3. Find the weight: Weight = Volume x Density = 63 cubic feet x 145 pounds per cubic foot = 9135 pounds.

Therefore, the cement bridge post weighs 9,135 pounds, option C.

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