Rumi and Rony can finish a task, working together, in 12 days. If Rony alone can finish that in 20 days, how many days will Rumi need to finish the task working alone ?

A 30
B 20
C 25
D 33

Correct Answer: 30

Together the can finish 1/12 of the work in a day. Rony alone can finish 1/20 of the work in a day. Rumi alone can finish = 1/12 - 1/20 = (5 - 3)/60 = 1/30 of the work in a day. So, Rumi alone can finish the work in 30 days.
Bissoy MCQ
#গণিত #ঐকিক নিয়ম (Unitary method) #Dutch-Bangla Bank Ltd #Dutch-Bangla Bank Ltd - Management Trainee Officer - 09.10.2009

Related Questions

Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?
A 1 hour
B 2 hours
C 3 hours
D 4 hours
E 5 hours
In a 100m race, Jami beats Rony by 4 sec. If Jami allowed Rony to start 16m ahead of him, then Jami and Rony reach the finishing point at the same time. How long does Jami take to run the 100m race?
A 24 sec.
B 21 sec.
C 20 sec.
D 20.5 sec.
Jony is 20 years older than Rony. In 10 years, Rony's age will be half that of Jony's. What is Rony's age?
A 3 years
B 10 years
C 20 years
D 25 years
Rony and Jony are working on an assignment. Rony takes 6 hours to type 32 page on a computer, while Jony takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages?
A 7 hr 30 min
B 8 hr
C 8hr 15 min
D 8 hr 25 min
A can complete a task alone in 8 days, while B takes 12 days to do it by herself. Together with C it takes them 4 days to complete the work. If C and D together can complete the task in 15 days, then how many days will D need to complete the task by herself?
A 36
B 32
C 40
D 30
If Arif works alone he will take 20 more hours to complete a task than if he works with Babu to complete the task. If Babu work alone, he will take 5 more hours to complete the task than if he works with Arif to complete the task. What is the ratio of the time taken by Arif to than taken by Babu if each of them works alone to complete the task?
A 2 : 1
B 5 : 3
C 7 : 5
D None of these
একজন চাকরিজীবীর আয় ও ব্যয়ের অনুপার ২০ঃ ১৫ হলে, তার মাসিক সঞ্চয় আয়ের শতকরা কত অংশ?
A ৩০%
B ১৫%
C ২০%
D ২৫%
একটি ট্রান্সফরমারের প্রাইমারি ও সেকেন্ডারি তারের ঘূর্ণনের অনুপাত 20ঃ 1 এবং সেকেন্ডারিতে 20 omega রোধ লাগানো আছে। যদি প্রাইমারিতে 220 V প্রয়োগ করা হয় তাহলে এর মধ্যে বিদ্যুৎ প্রবাহ হবে-
A 0.55 A
B 27.5 mA
C 27.5 A
D 5.5 mA
A and B can complete a task in 12 days. However, A had to leave a few days before the task was completed and hence it took 16 days in all to complete the task. If A alone could complete the work in 21 days, how many days before the work getting over did A leave?
A 7
B 5
C 9
D 3
Four men and 6 women finish a job in 8 days. while 3 men and 7 women finish it in 10 days. while 3 men and 7 women finish it in 10 days. In how many days will 10 women take to finish the work together?
A 32
B 36
C 40
D None

Next steps