form 1 math

2007-11-20 1:10 am

2 times x is subtracted form 200 . the difference is then incerased by 20%.if the overall result is equal to decresased x by 40%

回答 (3)

2007-11-20 1:25 am

✔ 最佳答案

(200-2x) (1+20%) =x(1-40%)
240-2.4x=0.6x
240=3x
x=80

2007-11-19 17:27:00 補充：
2 times x is subtracted from 200 ?

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2007-11-20 1:49 am

(200-2X)x120%=(100%-40%)X
240-2.4X=0.6X
240=3X
X=80

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2007-11-20 1:22 am

1.2 x (2X-200) = 0.4X
2.4X - 240 = 0.4X
2X = 240
X = 120

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