A and b working separately can do a piece of work in 6 and 9 days respectively; they work on alternate days starting with a on the first day. in how many days will the work be done?
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1/6 + 1/9
= 5/18
= 3days and 3/5 part of one day
= 5/18
= 3days and 3/5 part of one day
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