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1、The rate of a certain chemical reaction is directly proportaional 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 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
2、Each of the students in a certain class received a single grade of P,F or I. What percent of the students in the class were females?
(1) of those who received a P, 40% were females. (2) of those who received either an F or I, 80% were males.
正确答案:E
3、Each employee of Company Z is an employee of either Division X or Division Y, but not both. If each division has some part-time employees, is the retio of the number of full-time employees to the number of part-time employees greater for Division X than for Company Z?
(1) The ratio of the number of full-time employees to the number of part-time employees is less for Division X than for Company Z. (2) More than half of the full-time employees of Company Z are comployees of Division X, and more than half of the part-time employees of Company Z are employees of Division Y.
正确答案:D
4、If x,y,z are integers greater than 1, what is the value of x+y+z? (1) xyz = 70 (2) x / yz = 7/ 10
正确答案:A |
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