A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

B does 50% of a work in 20 days. C joins B and they together finish the remaining work in 4 days. C alone can do the whole work in ________ days. A. 10 B. 8 C. 12 D. 9

X does 25% of work in 20 days . Y joins X and they together finish the remaining work in 15 days. Y alone can do the whole work in ____days. A. 30 days B. 25 ^(1//2) days C. 26 ^(2//3) days D. 26 ^(1//3) days

A can do a piece of work in 80 days.He works at it for 10 days and then B alore finishes the remaining work in 42 days.How long will B take to do the entire work alone?