In a Type A dispersal bed, the sand layer has a minimum thickness of 300 mm and the stone layer has 200 mm. By how many millimeters does the sand layer minimum exceed the stone layer minimum?

In a Type A dispersal bed, the sand layer has a minimum thickness of 300 mm and the stone layer has 200 mm. By how many millimeters does the sand layer minimum exceed the stone layer minimum?

• A. 50
• B. 100
• C. 150
• D. 200

Answer: (B)

Subtract the smaller minimum from the larger to see how much one layer exceeds the other. The sand layer is 300 mm and the stone layer is 200 mm, so 300 − 200 = 100. The sand layer minimum exceeds the stone layer minimum by 100 millimeters. In the context of a Type A dispersal bed, this simple difference reflects how much thicker the sand layer is compared to the stone layer, which can impact filtration and drainage performance.

Subtract the smaller minimum from the larger to see how much one layer exceeds the other. The sand layer is 300 mm and the stone layer is 200 mm, so 300 − 200 = 100. The sand layer minimum exceeds the stone layer minimum by 100 millimeters. In the context of a Type A dispersal bed, this simple difference reflects how much thicker the sand layer is compared to the stone layer, which can impact filtration and drainage performance.