標題:
F.2 Maths Ratio
發問:
Sarah has 32 marbles and Cherie has 48 marbles. If Sarah and Cherie each gives the same number of marbles to Kelvin, the numbers of Sarah and Cherie's marbles will be in the ratio 13:21. Find the number of marbles that Sarah gives to Kelvin.From Mathematics in Action 2A (Longman) Revision Exercise 4Thank you. 顯示更多 Sarah has 32 marbles and Cherie has 48 marbles. If Sarah and Cherie each gives the same number of marbles to Kelvin, the numbers of Sarah and Cherie's marbles will be in the ratio 13:21. Find the number of marbles that Sarah gives to Kelvin. From Mathematics in Action 2A (Longman) Revision Exercise 4 Thank you.
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最佳解答:
Let x be the number of marbles that Sarah and Cherie each gives to Kelvin (32 - x) : (48 - x) = 13 : 21 21(32 - x) = 13(48 - x) 672 - 21x = 624 - 13x 8x = 48 x = 6 So, the number of marbles that Sarah gives to Kelvin is 6.
其他解答:
因為Sarah and Cherie each gives the "same" number of marbles to Kelvin 所以設Sarah and Cherie 各給x marbles 依題意得 (32-x):(48-x)=13:21 21(32-x)=13(48-x) 672-21x=624-13x 8x=48 x=6|||||Let x be the number of marbles that Sarah gives to Kelvin. (32-x)/(48-x) = 13/21 21(32-x)=13(48-x) 21(32)-13(48)=21x-13x 8x=48 x=6
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