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The concrete slab of size 40 foot by 36 foot by 5-inch-thick is reinforced with #4...

  1. The concrete slab of size 40 foot by 36 foot by 5-inch-thick is reinforced with #4 rebar at 16 inches on center both ways. The rebar is lapped 18 inches. Determine the number of 20-foot-long bars of #4 rebar needed to reinforce the slab.
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