Question 1109172
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This problem is exactly Problem 7  of the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Joint-work-word-problems-for-3-4-5-participants.lesson>Joint-work problems for 3 participants</A>

in this site.  See the solution there.


The request regarding calculators seems to be strange.


The problem is/was designed for solution through algebra and logical reasoning and does no assume using calculators.