註明步驟!!!!!
Johns savings is $300 more than his sister's. After giving $450 from his savings to his
sister, John's saving becomes 2/5 (2分之5) of his sister.
How much saving do they have altogether?
thx!!!!!!!!!!!
我想問一條數學(F.1)
2007-11-26 2:40 am
回答 (2)
2007-11-26 2:57 am
✔ 最佳答案
assume John's savings is $x, then his sister's saving is $(x-300)After giving $450 from his savings to his sister, John's saving becomes 2/5 (2分之5) of his sister.
x-450=2/5(x-300+450)
5x-2250=2x+300
3x=2550
x=850
Therefore .thier saving is x+(x-300)=2x-300=2(850)-300=$1400
2007-11-26 3:15 am
Let x be John's saving,his sister should be x-$300.
then:(x-$450)/(x-$300+$450)=2/5
5x-$2250=2x+$300
3x=$2550
x=$850
So they saving altogether should be:
=x+x-$300
=$850+$850-$300
=$1400
then:(x-$450)/(x-$300+$450)=2/5
5x-$2250=2x+$300
3x=$2550
x=$850
So they saving altogether should be:
=x+x-$300
=$850+$850-$300
=$1400
參考: me
收錄日期: 2021-04-25 17:19:25
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