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September 4th, 2019, 05:57 AM  #11 
Senior Member Joined: Jun 2019 From: USA Posts: 213 Thanks: 90 
^ That was my initial question, skipjack. The "and" made it sound that way, which seemed like it made it an indeterminate system.

September 4th, 2019, 06:28 PM  #12 
Global Moderator Joined: Dec 2006 Posts: 20,972 Thanks: 2222 
If they can work together, but not on the same problems, jill should work for 3/2 hours to complete 6 chemistry problems, but stop doing the math problems after 9/7 hours, having complete 9 maths problems. After 4/3 hours of working together, jack has completed 8 math problems and should stop doing math problems, but continue doing chemistry problems for a further 1/3 hours, completing 5 chemistry problems in total. In this way, their combined efforts have (optimally) resulted in the completion of 11 chemistry problems and 17 math problems, as required. 

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answer, impossible, linear algebra, math, simple, simply, system, system of equations 
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