S and T can finish a work in 50 days. they worked for 20 days together and then left.how much of the work is left.
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A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?
[A]. 40
[B]. 50
[C]. 54
[D].
60 @
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