求助一道数学题！！！

cxy1996 · 发表于 2015-8-3 23:00:26

The total price of a basic computer and a printer was $2,500. If the same printer had
been purchased with an enhanced computer whose price was $500 more than the price of
the basic computer, then the price of the printer would have been 1/5 of that total. What
was the price of the basic computer?
(A) $1,500
(B) $1,600
(C) $1,750
(D) $1,900
(E) $2,000

方块块 · 发表于 2015-8-3 23:16:10

我觉得应该是1900
Basic + Printer =Total=2500
Basic +500 +Printer =Total+500=3000,
代入左边的式子：Basic+500+1/5*3000=3000
所以得到Basic是1900

08JuHan · 发表于 2015-8-3 23:42:04

printer (2500+500)/5=600
basic computer=2500-600=1900

cxy1996 · 发表于 2015-8-3 23:51:02

方块块发表于 2015-8-3 23:16
我觉得应该是1900
Basic + Printer =Total=2500
Basic +500 +Printer =Total+500=3000,

同意！

cxy1996 · 发表于 2015-8-3 23:51:33

08JuHan 发表于 2015-8-3 23:42
printer (2500+500)/5=600
basic computer=2500-600=1900

知道了 that total指的是新组合的total 谢谢你！

cxy1996 · 发表于 2015-8-3 23:52:05

方块块发表于 2015-8-3 23:16
我觉得应该是1900
Basic + Printer =Total=2500
Basic +500 +Printer =Total+500=3000,

谢谢你！答案是 1900

求助一道数学题！！！

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