A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days In what time can A alone do it?

 A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days In what time can A alone do it?

A). 80

B). 100

C). 120

D). 150

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