Question 1110835
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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}}}
{{{(3/4)(320) = 240}}}  and {{{(5/7)(280)= 200}}}
320 + 200 = 520 know how to play chess