GMAT一道數(shù)學(xué)題
GMAT一道數(shù)學(xué)題
On monday,a certain animal shelter housed 55 cats and dogs.By Friday,exactly 1/5 of the cats and 1/4 of the dogs had been adopted; no new cats or dogs were brought to the shelter during his period.What is the greatest possible number of pets taht could have been adopted from the animal shelter between Moday and Friday?
On monday,a certain animal shelter housed 55 cats and dogs.By Friday,exactly 1/5 of the cats and 1/4 of the dogs had been adopted; no new cats or dogs were brought to the shelter during his period.What is the greatest possible number of pets taht could have been adopted from the animal shelter between Moday and Friday?
英語人氣：437 ℃時間：2020-06-28 22:06:43
優(yōu)質(zhì)解答
由題意知,貓和狗共55只,貓的只數(shù)是5的倍數(shù),狗的只數(shù)是4的倍數(shù).故設(shè)貓有5x只（其中x屬于正整數(shù)）,狗有4y只（其中y屬于正整數(shù)）且5x+4y=55由上得：x、y的正整數(shù)組合只有兩種：x=3,y=10或者x=7,y=5因此原有的動物數(shù)量有...
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