Question 961056
Let {{{ n }}} = the total number of students in the class
{{{ .75n }}} = number who were boys
{{{ .75n = 18 }}}
{{{ n = 18/.75 }}}
{{{ n = 24 }}}
There are 24 students in the class
check:
The girls have to be 25% of the class
There are {{{ 24 - 18 = 6 }}} girls in the class
{{{ 6/24 = 1/4 }}}
{{{ 1/4 = .25 }}}
25% are girls
OK