Using 80% wettable powder and spraying 15 acres at 10 lb per acre, how much chemical would you use?

To determine the total amount of chemical used when spraying 15 acres at 10 pounds per acre using an 80% wettable powder, the calculation involves the following steps:

1. Calculate total pounds needed for 15 acres: Multiply the number of acres by the pounds per acre.

[

15 , \text{acres} \times 10 , \text{lb per acre} = 150 , \text{lb}

]

This means you need 150 pounds of the active ingredient to treat the entire area.

2. Account for the concentration: Since the product is an 80% wettable powder, this means only 80% of the total amount is the active ingredient. To find out how much total product is required to obtain 150 pounds of active ingredient, you divide by the concentration:

[

\text{Total product needed} = \frac{150}{0.80} = 187.5 , \text{lb}

]

Therefore, using 80% wettable powder, you would use a total of 187.5 pounds of the product to ensure that there are 150 pounds of the active component available