40% of students in a class are smart. The rest are stupid. Half the students play sports and half don't. If 20% of the students are smart and play sports, what percent of the students are stupid and don't play sports?
A. 30
B. 40
C. 50
D. 60
E. None
সঠিক উত্তরঃ
A.
30
Explanation:
Related Questions (Any University/Year)
- একটি সোনার গহনার ওজন ১৬ গ্রাম। এতে সোনা ও তামার অনুপাত ৩ঃ ১। এতে কি পরিমাণ সোনা মেশালে ৪ঃ ১ হবে?
- The greatest possible value of C is how much greater than the smallest possible value of D?
- The difference between the interests received from two different banks on Taka 500 for 2 years in Taka 2.5. The difference between their rates is_____.
- 40% of students in a class are smart. The rest are stupid. Half the students play sports and half don't. If 20% of the students are smart and play sports, what percent of the students are stupid and don't play sports?
- During a sale at a music store, if a customer buys one tape at full price, the customer is given a 50 percent discount on a second tape of equal or lesser value. If Linda buys two tapes that have full prices of $15 and $10, by what percent is the total cost of the two tapes reduced during this sale?
- A set of 6 flower vases of different sizes cost Base taka 825. Each vase costs 25 taka more than the next on below it in size. What was the cost of the largest vase?
- By selling goods for Tk. 153, Shabit loses 10%. For how much should he sell them to gain 20%?
- Two tailors X and Y are paid a total of Tk. 550 per week by their employer. If X is paid 120 percent of the sum paid of Y. How much is Y paid per week?
- If 12 men can build a wall 180 m long in 54 days ,how many days it will take to build a similar wall 160 m long ,if 16 men working on it
- একটি পুকুরে কচুরিপানা প্রতিদিন দ্বিগুণ হারে বৃদ্ধি পায়। যদি পুকুরটি কচুরিপানা দিয়ে ভরে যেতে ২৮ দিন লাগে তবে অর্ধেক পুকুরটি ভরে যেতে কত দিন লাগবে?
- 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.
- In the trapezoid, <CAB= DBA =60° and AC= DB = 10 cm. Find the area of the trapezoid.
- The smallest of three consecutive even integers is 8 less than three times the largest. What is the largest of these integers?
- What is the average of four tenths and five thousandths?
- ৭২৯ লিটারের মিশ্রণে দুধ এবং মধু ৭ঃ২ অনুপাতে থাকে । এই অনুপাতটি ৭ঃ৩ এ পরিবর্তন করার জন্য এতে কী পরিমাণ মধু মেশাতে হবে?
- 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?
- The salary of Mr. Amitabh is 33.33% more than that of Mr. Asif, and the salary of Mr. Asif is 25% less than that of Mr. Anik. If the salary of Mr. Anik is Tk. 20,000, what is the salary of Mr. Amitabh?
- Lima is 6 years older than her sister Sharmin, and Jamal is 5 years older than Lima. If the total of their ages is 41, how old is Jamal?
- ৮৮০-এর তিন-চতুর্থাংশের এক-দশমাংশের অর্ধেক কত?
- The total age of A and B is 12 years more than the total age of B and C.C is how many years younger than A?
- আপনার কাছে পাঁচটি আধুলি, ৮টা সিকি আছে। আর কয়টা ১০ পয়সার মুদ্রা দিলে মোট ৫ টাকা হবে?
- Two men, A and B, run a 4 km race in a circular course of 1/4 km. If their speeds are in the ratio of 5 : 4 , how often does the winner pass the other?
- A lady went shopping and bought one red bag and 15 black bags. The cost of the red bag was 3 times the average cost of a black bag. If she had spent a total of TK X fir the bags, what was the cost of the red bag?(in terms of x)
- If (X) is 150 more than (Y), what is the value of (Y) in the figure on the right hand side?
- Fine for carpool lane violation is \(133. Bench warrant for \(229.25 includes 15% fee. How many unpaid tickets?
- 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 11 taka per dozen and thus made a profit of 100 taka. How many dozens of banana did he purchase altogether?
- ১১ জন কুমোর ৪ দিনে ১৪৩টি হাড়ি তৈরি করতে পারে। ৪ দিনে ১৬৯টি হাড়ি তৈরি করতে কত জন কুমোরের প্রয়োজন?
- If (x +y =a), (Y +z=b) and (x +z =c) what is the average (arithmetic mean ) of x, y and z?
- The first term in a sequence is x. Each subsequent term is three less than twice the preceding term. What is the 5th term in the sequence?
- 39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?
- একটি মানচিত্রে ১ ইঞ্চি দূরত্ব ২০ মাইলের সমান। দুটি শহরের মধ্যবর্তী দূরত্ব ৬.২ ইঞ্চি। শহর দুটির প্রকৃত দূরত্ব কত?
- If 12 men can reap 120 acres of land in 36 days, how many acres of land can 54 men reap in 54 days?
- Instructions: DO NOT USE CALCULATOR. Figures are not drawn to scale. Arif has x marbles of which 20% are black and 80% are red. Babu has y marbles of which 40% are black and 60% are green. Dipu has z marbles of which 50% are black and 50% are blue. If 25% of the total marbles they have are black, what is x?
- Lamisa's age is 5 years more than twice Galib’s age. Zihan’s age is 13 years less than 10 times Galib’s age. If Zihan is 3 times as old as Lamisa, how old is Lamisa?
- How many flowers are there if all of them are roses except two, all of them arc tulips except two, and all of them are daisies except two?
- A box contains 24 red socks and 43 green socks. How many green socks must be removed from the box so that 60% of the socks in the box will be green?
- If a/x+b=1 , what is the value of x?
- 10 টাকা × 15 টাকা ÷ টাকা × 30 টাকা = কত?
- If x is positive integer and y > -2 , which of the following must be positive ?
- যদি ৬ জন বালক ৬ মিনিটে ৬ পৃষ্ঠা লিখতে পারে তাহলে ১ জন বালকের এক পৃষ্ঠা লিখতে কত সময় লাগবে?
