Question 475411
if {{{2/5}}} of the sudents are boys, then {{{1-2/5=3/5}}} of the students are girls
Have ratio
{{{3/5}}}-{{{12}}}
{{{1}}}-{{{x}}}
Equation
{{{(3/5)x=12}}} multiply by {{{5}}}
{{{3x=12*5}}}
{{{3x=60}}} divide by 3
{{{x=60/3}}}
{{{x=20}}} students in the group