Question 1069992
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A project requires three engineers working together for 15 days. After working for 5 days, extra two engineers join into the team. 
How many days are anticipated to finish the rest of the project?
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After working for 5 days, the three engineers completed {{{1/3}}} of the job, and {{{2/3}}} remains to complete.


Now we have 5 engineers, the rate of each is {{{1/(3*15)}}} = {{{1/45}}}.


They will complete the remaining {{{2/3}}} of the job in {{{2/3}}} : {{{5/45}}} = {{{((2/3))/((5/45))}}} = {{{(2*45)/(3*5)}}} = {{{90/15}}} = 6 days.


<U>Answer</U>.  6 days.
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