Question 1095920
Team1 does one job in x days.
Team2 does one job in y days.

Description would give  {{{system(((1/x)+1/y)=1/12,and,(1/x+1/y)*8+(1/y)*7=1)}}}.


Might be easier if give different variable to {{{1/x}}} and to {{{1/y}}}, and then treat the system as two linear equations.


{{{system(p=1/x,r=1/y)}}}


{{{system((p+r)=1/12,and,(p+r)*8+7r=1)}}}


{{{system(12p+12r=1,8p+8r+7r=1)}}}


{{{system(12p+12r=1,8p+15r=1)}}}------solve this linear system for p and r.


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I have not checked these results yet but solution found is {{{highlight_green(x=28)}}} and {{{highlight_green(y=21)}}}.