Question 31026
First we need to solve the first equation for one lumberjack in one day, X.  The equation would be
{{{3(8x)=18}}}
{{{24x=18}}}
{{{x=0.75}}}  or one lumberjack can cut down 0.75 trees in one day

Now the second equation:
{{{2(28x)=t}}} where t=total number of trees and x=number of trees one lumberjack can cut down in one day.  Plug in the value for X
{{{2(28*0.75)=t}}}
{{{42=t}}}  42 trees