    Sentence 1: A ‘can do a piece of work in  24 days. After 4 days B joins & together  finish remaining work in.16-days, In how  many days Balone can finish the work?    Sentence 2: Three persons, working full  day, .can finish a job-in-10 days. How  many days will it take to finish the same  job if one of them can only work half  day?    