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I have to cover a lawn that is 15ft by 40 ft. one pound bag covers 100 sq feet and the seed is sold in 5lbs bags, how many bags will he nned?

how  many bags will he need?
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The area of the lawn is (15 feet)x(40 feet) = 600 square feet
If the seed is only sold in 5 lbs bags, and each pound covers 100 sq feet, then one 5 pound bag covers an area = (100sq ft per lbs)x(5 lbs) = 500 sq feet
So you'll need two 5 lbs bags, but will use only one pound out of the second bag.  Ideally, get one 5 lbs bag and one 1 lbs bag.