Question 196665
Use a ratio. Let R be the number of rabbits and F be the  number of fox.
You are told {{{F = R - 35}}}
{{{2/9 = F/R}}}
{{{2/9 = (R-35)/R}}}
{{{2*R = 9(R-35)}}}
{{{2R = 9R - 315 }}}
{{{315 = 7R}}}
{{{45 = R}}}
{{{F = R-35}}}
{{{F=10}}}
Check your answer, does 2/9 = 10/45?