1. 19 men working 15/2 hours a day can finish a job in 21 days. How many hours a day must
2
45 men work to complete it in 7 days?
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Environment can be defined as a sum total of all the living and non-living elements and their effects that influence human life. While all living or biotic elements are animals, plants, forests, fisheries, and birds,. non-living or abiotic elements include water, land, sunlight, rocks, and air.
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