Math CentralQuandaries & Queries


Question from Sara:

I have a spray rig that is 80' wide. How many feet must I go to have sprayed an acre?

Hi Sara,

An acre is 43560 square feet and driving your spray rig $L$ feet creates a rectangle of width 80 feet and length $L$ feet. The area of a rectangle is the length times the width and hence you have

\[ L \times 80 = 43560 \mbox{ square feet.}\]

Solve for $L.$


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