Total number of boys and girls in a class is A. The total number of girls subtracted from the total number of boys is B. Now please express the portion of girls to the total strength in terms of 'A' and 'B'.

• B+G=A.....eQ1
  B-G=B.....eq2
  SOLVE IT THEN B=(A+B)/2& G=(A-B)/2
  so portion of girl is=(Girl)/(total student)
  =(A-B)/2A here A is boy + girl
• 10 years agoHelpfull: Yes(3) No(0)
• Let x denote the number of boys. Let y denote the number of girls.
  
  A = x + y -> equation 1
  B = x - y -> equation 2
  
  Subtracting equation 2 from equation 1 we will get y = (A - B)/2 -> equation 3
  
  Ratio of total number of girls to the total strength will be y / x + y.
  
  Now substituting A for x + y as per equation 1 and (A - B)/2 for y as per equation 3 we will get the answer as
  (A - B)/(2*(A + B))
• 11 years agoHelpfull: Yes(1) No(9)
• X+Y=A
  X-Y=B
  Solving this equations We get Boys = (A+B)/2
  By Putting that value in any equation
  We get Girls = (A-B)/2
• 9 years agoHelpfull: Yes(1) No(0)