Answer:C Explanation:If A and B together can do a piece of work in x days and A alone can do the same work in y days, then B alone can do the same work in x y/ y x days. Therefore, the No. of days Shyam take to finish the job alone = 8 -12/12 * 8 = 8 -12/4 = 24 days.
Answer:C Explanation: A can finish the whole work in 20 - 5/4 days = 25 days A and B together finish the whole work in 5 - 3 days = 15 days Therefore, B can finish the whole work in 25 B/ 25 + B = 15 25 B = 15 (25+B)= 375 + 15B 10B = 375 and B = 375/10 = 37½ days
Answer:C Explanation: B's 1 day's work = (1/12 - 1/20) = 2/60 = 1/30 Now, (A + B)'s 1 day's work = (1/20+1/60) = 4/60 = 1/15. [B works for half day only] So, A and B together will complete the work in 15 days