math
posted by viri .
mrs. cooper's class has 11 more girls than boys. there are 35 students in all. how many girls are there?

Sum and difference problems can be readily solved without algebra by the following:
bigger number = (sum+difference)/2
smaller number = (sum  difference)/2
Example, since there are more girls than boys, so
number of girls = (35+11)/2 = 23
number of boys = (3511)/2 = 12 
mrs cooper has 35 students in her class. she has 11 more girls than boys. How many girls are in her class.
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A class has 35 students, there are 9 more boys then girls. how many girls are there?