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標題:
我想問一條數學(F.1)
發問:
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!!!!!!!!!!!
最佳解答:
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
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 =$14004E350C6F06A145F0
我想問一條數學(F.1)
發問:
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!!!!!!!!!!!
最佳解答:
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
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其他解答: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 =$14004E350C6F06A145F0
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