Create a proportion: 8000/4 = 7000/x
8000x = 28000
then divide
8000x/8000 = 28000/8000
that equals x = 3.5 tons
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Create a proportion 8000/4 = 7000/x
then simplify to 2000/1 = 7000/x
7000 = 2000x
then divide
7000/2000 = 2000x/2000
3.5 tons = x