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[GMAT数学题讨论] 07prep-ps1第142题

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icetong123 发表于 2014-8-16 16:41:13 | 显示全部楼层 |阅读模式
本帖最后由 icetong123 于 2014-8-30 13:37 编辑

142.The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
(A) 100% decrease
(B) 50% decrease
(C) 40% decrease
(D) 40% increase
(E) 50% increase
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