[問題] 數學 求救

[bluesoul92 (Vicky)]

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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推 burgessx:1. 0.8*3/4*3/2 = 0.9  2. 1/3 : 2/2 : 3/1
→ bluesoul92:3q~~^^