SOLUTION: In a school of 600 students,the number of boys is 40 more than the number of girls.3/4 of boys and 5/7 of girls know chess.Find the number of students who know chess.

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: In a school of 600 students,the number of boys is 40 more than the number of girls.3/4 of boys and 5/7 of girls know chess.Find the number of students who know chess.      Log On


   

Question 1110835: In a school of 600 students,the number of boys is 40 more than the number of girls.3/4 of boys and 5/7 of girls know chess.Find the number of students who know chess.
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi  

In a school of 600 students,the number of boys is 40 more than the number of girls. 

 Let x represent the number of girls:

 x + (x+40) = 600

2x = 560

x = 280, number of Girls, 320 Boys 600-280

%283%2F4%29%28320%29+=+240  and %285%2F7%29%28280%29=+200

320 + 200 = 520 know how to play chess