A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:
A. 7/15
B. 8/15
C. 4/15
D. 7/20
E. 4/5
সঠিক উত্তরঃ
B.
8/15
Explanation:
Related Questions (Any University/Year)
- A person spends 20 percent of his monthly salary for his son's education. In the coming month, he is expected to get an increment of TA. 170 and he plans to spend half of that increment also for his son's education would be TA. 645 . what is the present salary of that person?
- Machine A produces bolts at a uniform rate of 120 every 40 seconds, and Machine B produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce total of 200 bolts?
- While selling a dangerous artifact, Tanisha was asking for such a price that will enable her to offer a 10% discount and still make a profit of 20% on cost. If the cost of the artifact was Tk. 30, what was her asking price?
- Sharif ran a 2 mile race at an average speed of 8 miles per hour. If arif ran the same race at an average speed of 6 miles per hr. How many minutes longer than sharif did arif take to complete the race?
- The highest percentage increase in the production rate that keeps the profit positive is:
- If the ratio of the radii of two circles is 3 to 2 then the ration of the areas of the two circles.
- X হচ্ছে একটি ধনাত্মক সংখ্যা। যখন X+1 কে ৬ দ্বারা ভাগ করা হয় তখন অবশিষ্ট থাকে ৫। X কে ?? দ্বারা ভাগ করলে অবশিষ্ট থাকে-
- The price of sugar increased by 10%. What percentage of consumption of sugar is to be reduced in order to keep the expenditure on sugar at the same level?
- ৪টি গরু ৪ দিনে ৪ বালতি দুধ দিলে, কত দিনে ৮ টি গরু ৮ বালতি দুধ দিবে?
- A company has 3,600 employees among which 1/3 are clerical. If the clerical staff is reduced by 1/3, what percent of the total employees would be clerical staff?
- The average mark obtain by 10 students was 6 and the average mark obtained by 6 students was 17. What was the average mark obtained by all 16 students ___.
- If a, b and c are 3 consecutive integers in that order, which of the following has the lowest value?
- তোমার নিকট 52 গ্রাম ও 116 গ্রাম ওজনের অনেকগুলো লোহার বার আছে। এগুলোকে দাঁড়িপাল্লার উভয় প্রান্তে ব্যবহার করে সর্বনিম্ম কত গ্রাম ওজনের জিনিস মাপা যেতে পারে?
- যদি একটি কাজ 9 জন লোক 12 দিনে করতে পারে, অতিরিক্ত 3 লোক করলে কাজটি কত দিনে শেষ হবে?
- A group of friends share a bill for £ 13.69 equally between them. How many were in the group?
- ১৯৯৯ সালে, ডায়ানা ১০টি ইংরেজি বই এবং ৭টি ফরাসি বই পড়েছিলেন। ২০০০ সালে তিনি ইংরেজি বইয়ের চেয়ে দ্বিগুণ ফরাসি বই পড়েন। দুই বছরে তিনি যে বইগুলো পড়েছিলেন তার ৬০% যদি ফরাসি হয়, তাহলে ২০০০ সালে তিনি কতগুলো বই পড়েছিলেন?
- In a flight of 600 km , an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by \(200~km/hr\) and the time of flight consequently increased by 30 minutes. The duration of the flight was:
- The members of an association decided to contribute equally to create a fund of Tk. 45,000. Five members refused to contribute, so each of the other members had to contribute additional tk. 15 for that fund. How many members were there in the association?
- If 6 workers can complete 9 identical job in 3 days, how long will it take 4 workers to complete 10 such jobs ?
- A rope , x feet long, is cut into two pieces such that the length of one piece is 1 foot more than twice the length of the other piece. Which of the following is the length, in feet, of the larger piece?