71. A works twice as fast as B. if both of them can together finish a piece of work in 12 days, then B alone can do it in 


72. A man, a woman and a boy can complete a job in 3 days, 4 days and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in 1/4^{th} of a day? 


73. A does 4/5^{th} 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? 


74. A can do 1/4^{th} part of the work in 10 days, B can do 40% of the work in 40 days and C can do 1/3^{rd} of the work in 13 days. Who will complete the work first? 


75. A alone can finish a work in 10 days which B alone can finish in 15 days. If they work together and finish it, then out of a total wages of Rs.3000, A will get: 


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Those are all planning for any competitive examinations can use this segment to enhance their abilities.