Question 1057630
b for boys
g for girls
p for pencils


{{{p/(b+g)=4}}}, takes care of the first sentence.


{{{b=g+g/3}}}, describes the second sentence.


Thirty-six pencils for the g number of girls:
Remember, 4 pencils to each student.
{{{4(pencils/student)}}};
{{{36*(pencils)(1/4)(students/pencils)=9*students}}}------and this again is a description given about the number of girls.  This means, {{{highlight(g=9)}}}.



There are two found equations to use.  You choose which to give a solution for number b of boys.