求详解，怎么算都跟答案不一样.....
Ifthereisnowaste,howmanysquareyardsofcarpetingisneededtocoverarectangularfloorthatis1...
If there is no waste , how many square yards of carpeting is needed to cover a rectangular floor that is 12 feet by 18feet?(1yard=3feet)
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12feet=12/3=4yard 18feet=18/3=6yard
s=4*6=24square yards
s=4*6=24square yards
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