How much larvicide should be spread over the lagoon surface if the weight of the larvicide is 8.5 lbs/gal, the lagoon surface area is 5 acres & 3 ft deep, and the recommended dose is 1 lb/10,000 ft²?

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Multiple Choice

How much larvicide should be spread over the lagoon surface if the weight of the larvicide is 8.5 lbs/gal, the lagoon surface area is 5 acres & 3 ft deep, and the recommended dose is 1 lb/10,000 ft²?

Explanation:
Dosing by surface area is the key idea here, so depth isn’t part of the calculation. First convert the lagoon area to square feet: 5 acres × 43,560 ft²/acre = 217,800 ft². At 1 lb per 10,000 ft², you need 217,800 ÷ 10,000 = 21.78 lb of larvicide. With a weight of 8.5 lb per gallon, the volume required is 21.78 ÷ 8.5 ≈ 2.561 gallons. Rounding to a practical value gives about 2.6 gallons, and the closest available option is 2.8 gallons.

Dosing by surface area is the key idea here, so depth isn’t part of the calculation. First convert the lagoon area to square feet: 5 acres × 43,560 ft²/acre = 217,800 ft². At 1 lb per 10,000 ft², you need 217,800 ÷ 10,000 = 21.78 lb of larvicide. With a weight of 8.5 lb per gallon, the volume required is 21.78 ÷ 8.5 ≈ 2.561 gallons. Rounding to a practical value gives about 2.6 gallons, and the closest available option is 2.8 gallons.

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