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做GMAT PREP时遇到2道数学题,不懂题目是啥意思?请哪个位大N指教.水平实在很菜,请别见笑.
MATH
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%, which of the following is closet to the percent change in the concentration of chemical A required to keep the reaction rate unchanged.
A. 40% increased
For a finite sequence of nonzero numbers, the number of variation in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of two consecutive terms is negative. What is the number of variations in sign for the sequence 1,-3,2,5,-4,-6.
A. 3
还有,这题SC.B里的majority和 are的用法没问题吗?还有B的表达好在哪儿?诚请高手指教.
SC
A) Women are expected to be the majority of students entering law school this fall, a trend ultimately placing more women in leadership position in politics and business.
B)The majority of students entering law school this fall are expected to be women, a trend that will ultimately place more women in leadership position in politics and business.
Answer. B
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