[問題] 數學 求救
1. A decorator bought a bolt of defective cloth that he judged to be 3/4
usable, in which case the cost would be $0.8 per usable yard. If it was later
found that only 2/3 of the bolt could be used, what was the actualcost per
usable yard? 答案$0.9
2.Three automobiles travel distances that are in the ratios of 1:2:3. If the ratios of the traveling times over these distances for these automobiles are 3:2:1 in the same respective order, what are the ratios og their respective average speeds? 答案 1:3:9
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