If you are proportioning a concrete mix with a water-to-cement ratio of .40 and know that you are using 320 pounds of water per cubic yard, how much cement would you need to use?

Question

If you are proportioning a concrete mix with a water-to-cement ratio of .40 and know that you are using 320 pounds of water per cubic yard, how much cement would you need to use?

BlackTom AI · Accepted Answer

The problem asks for the cement content given a water-to-cement ratio of 0.40 and a known water amount of 320 pounds per cubic yard.
Option 1: 800 lbs. If water (320 lb) divided by cement equals 0.40, then cement = 320 / 0.40 = 800 lb. This matches the given ratio and the provided water quantity.
Option 2: 320 lbs. This would give a water-to-cement ratio of 320 / 320 = 1.0, not 0.40, so it misstates the relationship between water and cement.
Option 3: 640 lbs. This would yield a ratio of 320 / 640 = 0.5, which is higher than the specified 0.40, making it inconsistent with the given ratio.
Option 4: cannot be determined. Since the problem provides a clear water quantity and the required ratio, cement amount can be calculated directly, so this choice is incorrect.
In summary, using the formula w/c = water / cement and solving for cement with water = 320 lb and w/c = 0.40 leads to cement = 800 lb, validating Option 1 as the correct value.

If you are proportioning a concrete mix with a water-to-cement ratio of .40 and know that you are using 320 pounds of water per cubic yard, how much cement would you need to use?单项选择题

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