Alam starts working on a job and works on it for 12 days and completes 40% of the work. Then Babu joins Alam and together they complete the rest of the work in 12 days. How long will it take Babu to complete the job if he works alone?
A. 24 days
B. 30 days
C. 45 days
D. 60 days
Explanation: আলম 40% complete করে 12 দিনে 100% complete করে \(\frac{12 \times 100}{40} = 30\) দিনে। সুতরাং একদিনে করে 1/30 অংশ। দুইজনে 60% complete করে 12 দিনে। 100% complete করে \(\frac{12 \times 100}{60} = 20\) দিনে। সুতরাং একদিনে করে 1/20 অংশ। বাবু একদিনে করে \((1/20-1/30) = 1/60\) অংশ। সুতরাং বাবু 60 দিনে কাজ complete করে। সঠিক Answer (D).
Related Questions (Any University/Year)
- Y is four times as old as X. After 6 years, the sum of half of X's age and a fourth of Y's age will be the same as three times the present age of X. How old will X be after 6 years?
- A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles?
- কোন একটি পণ্যের দাম প্রথমে ১৫% বাড়ানো হলো এবং এরপর ১৫% কমানো হলে দাম-
- 55 men can finish á work in 42 days. How many additional men must be engaged to complete the work 9 days earlier?
- A car going 40 miles per hour set out on an 80 miles trip at 9.00 A.M. Exactly 10 minutes latter, a second car left from miles per hour, was the second car going if it caught up with the first car at 10.30 A. M.?
- A can work three times faster than B. A takes 60 days less than B to do a work. Find the number of days it would take to complete the work if both work together.
- 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?
- 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?
- Two planes leave the same airport at 1:00 pm. How many miles apart will they be at 3.00 pm if one travels directly north at 150 mph and other travels directly west at 200 mph?
- The average of eight numbers is 14 and the average of six of those numbers is 16. What is the average of the remaining two numbers?
- একখানা টেবিল 96 টাকায় বিক্রি করলে টেবিল এর ক্রয়মূল্য যত, লাভের শতকরা তত হয়। টেবিলটির মূল্য কত?
- A class of 50 girls and 60 boys sponsored a football game. If 52% of the girls and 30% of the boys attended the game, what percentage of the class went to the game?
- In a 500m race, the ratio of speeds of two contestants A and B is 3: 4. A has a start of 140m. Then A wins by-
- When positive integer x is divided by positive integer y, the remainder is 9. If x/y = 96.12, what is the value of y?
- Harun is three times us old as Tamim. In eight years, he will be twice as old as Tamim. How old was Harun 3 years ago?
- ABCD একটি সামন্তরিক। BD এর দৈর্ঘ্য = 2। BCD ত্রিভুজের সকল কোণ সমান। সামন্তরিকটির পরিসীমা কত?
- ∠ABE = 25° and ∠EDC = 100° . What is the value of ∠DCE ?
- একটি দ্রব্য ৩৮০ টাকায় বিক্রয় করায় ২০ টাকা ক্ষতি হলো। ক্ষতির শতকরা হার কত?
- Six years ago Alam was half the age he will be in six years. How old is Alam?
- If x is less than y, which of the following numbers must be greater than x and less than y?(I). (x+y)/2 (ll). xy/2 (lll). x2-y2