2 times y is subtracted from 200. The difference is then increased by 20%. If the overall result is equal to decreasing y by 40%, find y
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2006-11-13 16:45:04 · 3 個解答 · 發問者 Yanka 3 in 科學 ➔ 數學
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2006-11-13 16:58:49 · update #1
( 200 - 2y )(120/100) = (1-40/100)y
( 200 - 2y )(1.2) = (0.6)y
240 - 2.4y = 0.6y
240 = 3y
y = 80
2006-11-13 17:06:29 · answer #1 · answered by ? 7 · 0⤊ 0⤋
(200-2y)(1+20%)=(1-40%)y
y=80
2006-11-14 11:35:35 · answer #2 · answered by ? 6 · 0⤊ 0⤋
(200-2y)(1+20%)=(1-40%)y
(200-2y)1.2=60%y
240-2.4y=60%y
240=3y
80=y
y=80
2006-11-13 17:07:31 · answer #3 · answered by Ho Lam 3 · 0⤊ 0⤋