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)
- ০.১ × ০.০১ × ০.০০১ = ?
- If 12 men can reap 120 acres of land in 36 days, how many acres of land can 54 men reap in 54 days?
- If a printer can print 2 pages per second, then approximately how many minutes will it take to print 5000 pages?
- A mixture of sugar and water contains sugar and water in the ratio of 3: 2. Another mixture of sugar and water contains sugar and water in the ratio 2: 5. In what ratio should the two mixtures be mixed so that the resulting mixture contains equal proportion of sugar and water?
- It is 165 miles from Dhaka to Chittagong. If a bus takes 1.5 hours to travel the first 65 miles how long must the bus take to travel the final 100 miles in order average 50 miles for the current trips?
- A club had 3 boys and 5 girls. During a membership drive, the same number of boy and girls joined the club. How many members does the club have now , if the ratio of the boys to girls is 3:4?
- X:Y=3:4 হয় 3Y-X:2X+Y কত হবে?
- 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?
- 3x+y=18, and x+3y=1.Find the value of 2x+2y
- If x is an integer and (x^2
- You buy equal number of two types of chocolate at the rate of TK 1/9 and TK 1/11 respectively. if you now sell them at the rate of TK 1/10 , what will be your profit / loss ?
- Ages of three persons are now in the proportion of 2:3:4 and in five years from now, the proportion will be 5:7:9. What is the present age of the youngest person?
- Sum of present ages of father & son is 70. 7 yrs ago, ratio was 5:2. Ratio after 5 yrs?
- Anwar is 3 times as old as Babu. In 13 years, Anwar will be 1 year younger than twice Babu's age. How old is Anwar now?
- একটি সংখ্যার ৭৫% এর সাথে ৭৫ যোগ করলে ফলাফল হিসেবে পূর্বের সংখ্যাটি পাওয়া যায়। সংখ্যাটি কত?
- একটি সোনার গহনার ওজন ১৬ গ্রাম। এতে সোনা ও তামার অনুপাত ৩ঃ ১। এতে কি পরিমাণ সোনা মেশালে ৪ঃ ১ হবে?
- পাঁচটি বিড়াল পাঁচটি ইঁদুর ধরতে সময় নেয় পাঁচ মিনিট। ৩০টি বিড়াল ৩০ টি ইঁদুর ধরতে কত সময় নেবে?
- If a, b and c are 3 consecutive integers in that order, which of the following has the lowest value?
- You are given the equation sqrt( 3x)+3=4, which one of the following is the correct value of x?
- B and C are points on a straight-line AD, where AB = BC = CD. What percent of AC is AD?
- Amio working alone ,can finish a certain job in 10 days and Sumio working alone can finish the same job in 15 days. If Amio and Somio are working together how many days do they need to finish the job?
- The average (arithmetic mean) of four different positive integers is 20. What is the greatest possible value of any of these integers?
- In a certain shipment 2% of the boxes shipped were damaged. If the loss per damaged box was Tk. 35 and the total loss due to damage was Tk. 700, how many boxes were shipped?
- যদি x<y, 2x=A এবং 2y=B হয়, তাহলে-
- যদি x+y=৫ এবং x-y=৫ হয়, তাহলে xy এর মান কত?
- Jasim went for shopping and spent 1/3 of his money for a bat and another Tk 5 for a ball. If Jasim still had1/2 of his money left, how much money did Jasim have originally?
- The average (arithmetic mean) of four different positive integers is 20. What is the greatestpossible value of any of these integers?
- An ambulance travels 10 miles at a speed of 75 miles per hour. How fast must the ambulance travel on the return trip if the round-trip travel time is to be 20 minutes?
- Which of the following is true?
- An electric pole 36 meters high casts a shadow of 24 meters at a particular time of a day. Find the height of a tower if it casts a shadow of 48 meters under similar weather conditions
- At Lions High school 100 students are taking chemistry and 80 students are taking Biology. If 20 students are taking both chemistry and Biology , what is the ratio of the students taking only chemistry to the number taking only Biology?
- The greatest possible value of C is how much greater than the smallest possible value of D?
- 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?
- The ratio between sumit's and Prakash's age at present is 2:3. Sumit is 6 years younger than Prakash. The ratio of Sumit's age to Prakash's age after 6 years will be.
- Arif bought 17 pens of three colors - black, green and red which cost Tk 5, Tk 10 and Tk 25 each. The total amount that Arif paid was Tk 205. If Arif bought twice as many green pens as red pens, how many black pens did he buy?
- At East West University, the faculty-to-student ratio is 1:9. If two-third of the students are female and one-quarter of the faculty is female, what fraction of the combined students and faculty is female?
- একটি সংখ্যা ৩৩ থেকে যত ছোট, ২১ অপেক্ষা তার দ্বিগুণ বড়। সংখ্যাটি কত?
- . The number of students in each section of a school is 24. After admitting new students, three new sections were started Now, the total number of sections is 16 and there are 21 students in each section. How many new students were admitted?
- 55 men can finish á work in 42 days. How many additional men must be engaged to complete the work 9 days earlier?
- Jeff takes 20 minutes to jog around the race course one sme, and 25 minutes to jog around a second time. What is his average speed in miles per hour for the whole jog if the course it 3 miles long?
