If Alan gives Brenda $ 5. 50, they will both have the same amount of money. If Brenda gives Alan $ 1. 50, Alan will have twice a

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问题 If Alan gives Brenda $ 5. 50, they will both have the same amount of money. If Brenda gives Alan $ 1. 50, Alan will have twice as much as Brenda. What did they have at the start?

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答案Alan:$26.50 Brenda:$15.50

解析 (假设Alan最初有x美元,Brenda最初有Y美元,可得方程组①x一5.50=Y+5.50②2(x—1.5)=Y+1.5。方程可解,x=26.50,Y=15.50)
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