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【OG20-P285-363题】Three roommates-Bela,Gyorgy,and Janos-together saved money for a trip. The amount that Bela saved was equal to 8% of his monthly income. The amount that Gyorgy saved was exactly 1/3 of the total amount saved by all 3 roommates. What was the total amount saved for the trip by all 3 roommates?1.Bela had a monthly income of $2,000.2.Janos saved 1.5 times as much for the trip as Bela.
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【知识点】
解方程组问题
【解析】
假设Bela, Gyorgy, Janos三人存的钱分别是B,G,J,求B+G+J
条件1:B=2000*8%=160,G和J未知,不充分
条件2:J=1.5B,具体大小未知,不充分
题目讨论 (3条评论)

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499685skw
条件1,知道B的saving,不知G和J的;条件2,知道J与B的关系,不知任何人的。两个条件合并,知道B和J的,因为G占1/3,所以B+J占2/3,所以可以求出全值。选C
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0 回复 2022-10-06 16:10:50
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贾思敏
题干:求B+G+J=? (1)B=2000*8%=160,但未知G、J,不充分 (2)J=1.5B,但未知B、J具体数值以及未知G,不充分 (1)+(2)结合: B=160 J=1.5*160=240 G=(1/3)*(B+G+J)即G=(1/3)*(160+G+240),就可以算出G了,然后B、J、G都知道了,肯定能求出B+G+J的值啦
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0 回复 2021-09-17 11:23:45
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zherusalem
想的太快,算出来: 求B+G+J=? 1)不行,则B,C,E 2) 单独不行,则C, E 合起来看,B=0.08*2000, J= 1.5*0.08*2000 又G=1/3*(B+J+G), 代入求G,相加得和
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0 回复 2020-01-19 03:57:22