SAT历年真题At a track meet,2/5 of thefirst-place finishers attended Southport High School,and 1/2 of them weregirls.If 2/9 of the first-place finishers who did NOT attend Southport HighSchool were girls,what fractional part of the total number of
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SAT历年真题
At a track meet,2/5 of the
first-place finishers attended Southport High School,and 1/2 of them were
girls.If 2/9 of the first-place finishers who did NOT attend Southport High
School were girls,what fractional part of the total number of first-place
finishers were boys?
(A) 1/9 (B) 2/15 (C) 7/18 (D) 3/5 (E) 2/3
选E.首先,0.4 乘以0.5 就是参加学校的男生.然后7over9乘以3over5 就是没有参加学校的男生.一共就是2over3
SAT历年真题At a track meet,2/5 of thefirst-place finishers attended Southport High School,and 1/2 of them weregirls.If 2/9 of the first-place finishers who did NOT attend Southport HighSchool were girls,what fractional part of the total number of
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