A and B does a piece of wrk in 12 days, if A does same wrk in 20 days wt abt B???

A and B does wrk in 12 days and A alone can do in 20 days, so hw many days B takes??
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(1/20) +(1/x) =(1/12)... x/20 +1=x/12... (x/12) -(x/20)=1... 10x -6x=120... 4x=120, so x=30
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