A and B can together do a piece of work in 6 days and A alone can do it in 9 days. The number of days B will take to do it alone is
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18 days is the answer to your question
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work done by A in = 6 days
" " " A in one day=1/6
work done by B in =9 days
" " " B in one day=1/9
work done by both in one day=1/6 - 1/9
= 3 - 2 /18
= 1/18
= 18 days =
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