In a class,the average score of girls in an examination is 73 and that of boys is 71.the average score of whole class is 71.8.the % of girls in an examination?

• 40%
  
  If number of boys=x & girls=y
  then, (71x+ 73y)/(x+y) =71.8
  0.8x=1.2y or y/x=2/3
  There are 2 girls among 5, So % of girls= 100*2/5 =40
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• Use alligation
  73-71.8 = 1.2
  71.8-71 = .8
  
  % of girl = 1.2/(1.2+0.8)*100 = 60
  % of boy = 40
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