Question 1011698
k,c,e,s,a, variables for those people.


{{{system(k=4c,e=c+6,e=s-6,a=2c,k+c+e+s+a=81)}}}


Look for any clever substitutions and processes using them that you can find.  More than one way.  Something which appears a good start is substitute for e in all the equations, and simplify that resulting system.