Question 962399

In a school, 5/7 of the students are boy. If there are 300 girls, find the number of boys in the school.
<pre>As {{{5/7}}} of students are boys, then {{{2/7}}} of students are girls.
Let number of boys be B
Then we get: {{{(5/7)/(2/7) = B/300}}}
{{{(5/7) * 300 = (2/7) * B}}} ------- Cross-multiplying
{{{1500/7 = 2B/7}}}
1500 = 2B ------- Denominators are equal and so are the numerators 
B, or number of boys = {{{1500/2}}}, or {{{highlight_green(750)}}}