Question 1064288
If A and B are their individual rates in WORK per DAYS, then this system describes the situation:


{{{system((A+B)18=1,(A+B)*10+B*12=1)}}}


SIMPLFICATIONS


18A+18B=1
-
10A+10B+12B=1
10A+22B=1
-
{{{system(18A+18B=1,10A+22B=1)}}}
Solve this system for A and B, but you will want the reciprocal of A, if the question you want is, how much time does "A" need alone to do one piece of work.