Question 422325
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Hi
Gab can finish sewing 100 shirts in 15 days. Or 100/15 = 20/3 per day 
He has been working for 3 days when he asked help from another tailor.
  3*(20/3)  20 shirts done. 
Let x represent the time it takes the other tailor solo
Question states*** Per day the Equalizer.  
Gab solo would take 12 days for 80 shirts  (20/3)/1 = 80/12)
{{{ 1/12 + 1/x = 1/3}}}  |time together for the 80 shirts left
 Solving for x
   x + 12 = 4x |multiplying thru with 12x so as all denominaotrs=1
      12 = 3x
       x = 4days,  the time it would take the other tailor alone for "80 shirts"
   For "100 shirts", it would take the other tailor 5 days.

CHECKING our Answer***
  1/12 + 1/4 = 1/12 + 3/12 = 4/12 = 1/3