Question 942614
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The boys outnumber the girls 5 to 2.
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That means on the average, out of every 5+2=7 students, 
5 of them are boys and 2 of them are girls.  That means 

5/7ths of the 105 students are boys. 

and 

2/7ths of the 105 students are girls.

{{{5/7}}}{{{"×"}}}{{{105}}}{{{""=""}}}{{{matrix(1,2,75,boys)}}}

You can either get the number of girls by:

1.  Subtracting 105-75 = 30 girls

or

2. {{{2/7}}}{{{"×"}}}{{{105}}}{{{""=""}}}{{{matrix(1,2,30,girls)}}}

Edwin</pre>