a can do piece of work in 4 days . b and c together can do it in 3 days. while a and c together can do it in 2 days . how long b alone would take to do the whole work.
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ac-bc =2day -3day
=24hours in 1day
=24×2=48hours ,
24×3=72hours
=48-72=24hours
=94 -24=72hours
3days this is wrong❌ I know do by your self
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