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.
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 and
320 + 200 = 520 know how to play chess