Question 990773
The group is initially 30 men and 10 women.


Adding the x more women does not change how many men.


{{{(30)/(10+x)=5/4}}}


{{{30=(x+10)(5/4)}}}
{{{120=5(x+10)}}}
{{{120=5x+50}}}
{{{70=5x}}}
{{{highlight(x=14)}}}