যদি একটি কাজ 9 জন লোক 12 দিনে করতে পারে, অতিরিক্ত 3 লোক করলে কাজটি কত দিনে শেষ হবে?
A. 7 দিনে
B. 9 দিনে
C. 10 দিনে
D. 12 দিনে
সঠিক উত্তরঃ
B.
9 দিনে
Explanation:
Related Questions (Any University/Year)
- A sum of BDT 200 will be divided among 5 swimmers, named Emran, Durjoy, Chopol, Billal and Anabi, who have just finished a swimming competition. Everyone will receive at least BDT 5 and no two swimmers will receive the same amount of money. Emran has come \(1^{st}\) and will get BDT 80; Durjoy has come \(2^{nd}\), Chopol is \(3^{rd}\), Billal is \(4^{th}\) and Anabi is last. Moreover, the distribution of money is subject to the following conditions: • No one will get any fractional amount of money. • The swimmer who finishes earlier must receive more money than the swimmer(s) he defeats. What are the greatest and least amount of money, consecutively, that Billal can receive?
- If y/x =1/5 and 2x+y=33, then what is the value of x?
- In a class, the average score of boys in an examination is 86 and that of girls is 81. If the average score of the whole class is 83, then what percent of the class are the girls?
- in an exam, 90% passed History and 85% passed English if none of the students failled in both subjects and 225 passed in both subjects, calculate the number of students who have attended the exam.
- What is 10% of 20% of 30%?
- The Warm Muffin Bakery's cookie sales are always 60 precent of its muffin sales. What would be the increase in The Warm Muffin Bakery's cookie sales if its muffin sales, increased from 10,000 to 20,000?
- The product of two numbers is 72. If 24 is their LCM what is their HCF?
- Two hours after train A has started its journey, train B started from the same point to the same direction at a speed of 18 km/h. If the speed of train A is 9 km/h then how many hours would it take for train B to catch the first train?
- Rahat can complete a task in 30 minutes, working together with his brother Mominul, he can complete the same task in 20 minutes. How long would it take for Muminul working along to complete the task?
- If 14 farmers plough a field in three hours, how long will it take if 15 farmers to do the same job?
- Written as a percent 5 = ?
- 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:
- The electric company charge: Tk 0.3 per KWH. Rahim used 2800 KWH in April, 3200 KWH in May, and 3600 KWH in June. What was his average costs of electricity in taka for the 3 months?
- A man purchased equal number of bananas at two different rates- one at the rate of 8 Taka per dozen and the other at the rate of 10 Taka per dozen.After that,he sold those bananas at an average rate of 11Taka per dozen and thus made a profit of 100 taka .How many dozens of banana did he purchase altogether?
- How many liters of a mixture containing 80% alcohol should be added to 5 liters of a 20% solution to yield a 30% solution?
- একটি ক্লাসে ৩০ জন শিক্ষার্থী আছে । তাদের মধ্যে ১৮ জন ফুটবল খেলে ও ১৪ জন ক্রিকেট খেলে । ৫ জন কিছুই খেলেনা । কত জন ফুটবল ও ক্রিকেট উভয়ই খেলে ?
- ক এর লাইব্রেরীতে ৬টি শেলফ আছে । যে দুটি শেলফ -এ সমাজবিজ্ঞানের বই আছে সেগুলোর প্রতিটিতে ৯০ টি করে বই আছে। বাকি শেলফগুলোর প্রতিটিতে ৮০ টি করে বই আছে। ক এর লাইব্রেরীতে কত শতাংশ বই সমাজবিজ্ঞান ?
- যদি ৬ জন বালক ৬ মিনিটে ৬ পৃষ্ঠা লিখতে পারে তাহলে ১ জন বালকের এক পৃষ্ঠা লিখতে কত সময় লাগবে?
- 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?
- ফেরি পারাপারে চালকসহ একটি গাড়ি পার করার খরচ ৬ ডলার। একজন যাত্রির জন্য অতিরিক্ত ভাড়া ৫০ সেন্ট। যদি একটি গাড়ি পার করতে ৭.৫ ডলার খরচ হয়ে থাকে তবে গাড়িতে মোট কতজন লোক ছিল?