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Using Laths to Work Up a Lather

At 40 a bunch for laths, 5 a sq. yd. for labor, and 8 a pound for nails, allowing a half-pound to a bunch, what will it cost to lath a hall 124 ft. long, 60 ft. wide, and 50 ft. high?

What would be the difference in the cost of the laths if they crossed each other?

Solution:

Source: Edward Brooks, New Mental Arithmetic, Philadelphia: Christopher Sower Company, 1873