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Answer plus points within 30 minutes. Mathematics Teaching and Learning in Grade Eight Volume I p 129No. 1 1
Ya=80x+50(20-x)= 1000+30x

Yb = 60(24-x)+40[30-(24-x)]= 1680-20x

Total freight W=Ya+Yb=2680+ 10x.

Minimum, x minimum.

∵x & gt； = 0 20-x & gt； = 0 24-x & gt； =0 30-(24-x)>=0

∴0<； = x & lt=20

X=0 ∴, that is, all villages A are transported to factory D, 24 tons of villages B are transported to factory C, and 6 tons are transported to factory D ... The total freight is at least 2680 yuan.

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