A can do 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)
- ফেরি পারাপারে চালকসহ একটি গাড়ি পার করার খরচ ৫ ডলার। যাত্রীর জন্য অতিরিক্ত ভাড়া ৫০ সেন্ট। যদি একটি গাড়ি পার করতে ৬.৫ ডলার খরচ হয়ে থাকে তবে গাড়িতে মোট কতজন লোক ছিল।
- If the price of onion goes up by 25%, by how much should usage be reduced in order to keep the total expense for onion as before?
- ৫০ জন ছাত্রের গড় CGPA ৪.৬০ এবং ৪০ জন ছাত্রের গড় CGPA ৪.৭২ । এই ৯০ জন ছাত্র ছাত্রীর গড় CGPA কত?
- Thereare 209 doctors and nurses in a hospital. If the ratio of the doctors to the nurses is 11:8, then how many nurses are there in the hospital?
- তিন সদস্যের একটি বিতর্ক দলের সদস্যদের গড় বয়স ২৪ বছর। যদি কোনো সদস্যের বয়সই ২১ বছরের নিচে না হয় তবে তাদের কোনো একজনের সর্বোচ্চ বয়স কত হতে পারে?
- A company rents parking spaces at the rate of Tk. 100 per week or Tk. 300 per month. How much does a person save in a year (in Taka) by renting by month rather than by week?
- 3 persons A,B, C whose salaries together amount Tk 7200 ,spend 80%, 85% and 75% of their salaries respectively .If their savings are 8:9:20 .Find salary of B
- In a class of 200 students ,40 % are girls. 25% of the boys and 10% of the girls signed up for a tour to Cox's Bazar .What percent of the class signed up for the tour?
- The average age of a man and his son is 20. After 10 years, their age will be in the ratio 2:1. What was the age of the man and his son 5 years ago respectively?
- A scientist needs a 10% saline solution for an experiment .In his closet ,he finds a 20 ounce bottle of 25% saline solution.How many ounces of pure water should he add to the mixture to produce the correct saline solution?
- A certain elevator has a safe weight limit of 2,000 pounds. What is the greatest possible number of people who can safely ride on the elevator at one time with the average (arithmetic mean) weight of half the riders being 180 pounds and the average weight of the others being 215 pounds?
- The radius of a circle is increased by 10%, and then its area is increased by what percent?
- In a certain class \(\frac{1}{2}\) of the male and \(\frac{2}{3}\) of the female students speak English. If there are \(\frac{3}{4}\) as many females as males in the class, what fraction of the entire class speaks English?
- The average mark obtained in four sections of today's admission test is 19. If the England section is removed, the average mark at the remaining three sections is 21. What is the mark in English
- It takes 24 hours for 10 men to make 15 Christmas cakes. How many cakes can be made if 8 men work for 36 hours?
- If 2n=n2, then which of the following must be true?
- On a certai project, the only grades awarded were 745 and 100. If 85 students completed the projects and the average of their grades was 85, how many of them did score 100?
- A bus is travelling with 60 passengers. When it arrives at a stop, x number of passengers get off and 8 get on. At the next stop, on third of the passengers on board get off and 5 get on. There are now 37 passengers on the bus. Find x.
- Fresh watermelon contains 90% water by weight whereas dry watermelon contains 20% water by weight. Ben buys 64 kg of fresh watermelon for 160\$. At what price should Ben sell the dry watermelon to get a profit of 20%.
- If a and b possible integers and (a1/2b1/3)6 =432, what is the value of ab?
- Three workers P. Q. R can do a certain job at their own rate separately. If X represents the ratio of the work-speed of P and R, and Y represents the ratio of the work-speed of Q and R. such that \(X < Y\) and \(Y < 1\), who is the fastest worker of the three?
- An engineer designed a ball so that when it was dropped, it rose with each bounce exactly one-half as high as it had fallen. The engineer dropped the ball from a 16-meter platform and caught it after it had traveled 46.5 meters. How many times did the ball bounce?
- If a printer can print 2 pages per second, then approximately how many minutes will it take to print 5000 pages?
- A train 108 metre long is moving at a speed of \(50~km/hr\). It crosses a train 112 metre long coming from opposite direction in 6 seconds. What is the speed of the second train?