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Tanks... Alot!

An Army medium-tank design specified that its tonnage was to be subdivided in the following manner: 22/32 = weight of armor, machinery, oil, and guns. Of this tonnage, 8/21 was the machinery installation; 7/9 of this weight was the main propulsion unit, and 5/170 of this was electrical equipment. If 34/55 of this electrical equipment was copper, how much copper was present if the total overall weight of the tank was 80 tons?

Solution:

Source: W.C. Eddy's Wartime Refresher in Fundamental Mathematics, 1945, p. 5