A truck is loaded at a structural steel supply house for a delivery to a construction site. The order calls for 125 feet of channel iron, which weighs 3 3/4 tons 140 feet of I beam, which weighs 4 3/10 tons, and 80 feet of angle iron, which weighs 2 1/5 tons

step-by-step explanation:

their are no angles. sorry cant .

stop cheating

step-by-step explanation:

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4