math
posted by O .
if iron weighs 0.25lbs. per cubic inch, an iron bar 8'6" by 4" by 1/2" weighs?

8' 6" = 102 inches
V = 102 * 4 * (1/2)
V = 204 cu. in.
204 * 0.25 = _____ weight of iron bar
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