做PREP TEST 1有两题想不清楚,请大家帮忙解解.谢谢! 1,what fraction of this year's graduation students at a certain college are males? (1)of this year's graduation students, 33%of male and 20% of female transferred from another college (2)of this year's graduation students, 25% transferred from another college 2, the rate of a certain chemical reaction is derectly 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 follwing is closest to the percentchange in the concentration of chemical A required to keep the reaction rate unchanged.(the answer is 40%)