<PRE><B>Question 105584</B>
If the carpenter takes 8days to finish the job, in 1 day he will do {{{1/8}}} of work.

Similary let the other carpenter take a days to finish the job therefore he will in one day do {{{1/a}}} of the work

Combined in one day they will do {{{1/8 + 1/a }}}of the work in day

But we know that combined they take 4days to finish the job.SO in 1day they should do 1/4 of the work

{{{1/8 + 1/a = 1/4}}}

Can you solve for a?</PRE>