A colony of 15,000 ants increased by 50% after being fed. Then after 4 weeks without food, the number of ants dropped by 60%. What percentage decline did the original population undergo?
A. 72.5
B. 75
C. 90
D. 95.5
E. None of these
সঠিক উত্তরঃ
E.
None of these
Explanation:
Related Questions (Any University/Year)
- In a shipment of 120 machine parts, 5% were defective. In another shipments of 80 machine parts, 10% were defective. For the two shipments combined, what percent of machine parts were defective?
- Instruction: Each problem consists of a question followed by two statements. Decide whether the data in the statements are sufficient to answer the question. Dipu (D) is 15 years older than his brother Enam (E). \((D = E + 15)\). How old is Dipu? (1) Twenty years ago, Dipu's age was twice that of Enam. (2) Ten years later, Enam's age will be \(\frac{3}{4}\) (assuming the symbol is a typo for a fraction like \(\frac{3}{4}\) or the solution is based on the logic of sufficiency) that of Dipu.
- X sells a product of Y and makes a profit of 25%. Y sells it to Z at a loss of 20%. If Z buys it for tk. 140 what price X paid for it?
- The average of 5 consecutive integers starting with m as the first integer is n. What is the average of 9 consecutive integers that start with n (in terms of m)?
- A machine puts c caps on bottles in m minutes. How many hours will it take to put caps on b bottles?
- X is 10 years older than his wife who is 4 times as old as her son. if the son was 5 years back become 4, what is the age of X?
- One laptop seller is planning to increase the price/laptop by BDT 10,000 from the next month. Market research shows that with this increase in price he will be able to sell 6 fewer laptops in the next month but the total revenue will increase by BDT 32,000 to BDT 760,000. What is the number of laptops the seller will sell in the next month at this new price?
- In takes one machine 4 hours to complete a production order and another machine 3 hours to complete the same order. How many hours would it take when both machines complete the order simultaneowsly at their respective rates?
- The price of article has been reduced 25%.In order to restore the original price the new price must be increased by
- Fine for carpool lane violation is \(133. Bench warrant for \(229.25 includes 15% fee. How many unpaid tickets?
- Two boats on the opposite shores of a river start moving towards each other. When they pass each other they are 750 yards from one shoreline. They each continue to the opposite shore, immediately turn around and start back. When they meet again they are 250 yards from the other shoreline. Each boat maintains a constant speed throughout. How wide is the river?
- A club wants to mix 20 pounds of candy worth $5.00 per pound with candy worth $5.00 per pound to reduce the cost of the mixture to $5.00 per pound. How many pounds of the $5.00 per pound candy should be used?
- কোন মূলধন ২ বছরে বার্ষিক সুদে ২৮০০ টাকা এবং ৫ বছরে ৩২০০ টাকা হয়। মূলধন ও সুদের হার কত?
- একটি গাড়ির সামনের ও পেছনের চাকার পরিধি যথাক্রমে ৩ ও ৪ মিটার। গাড়িটি কত কিলোমিটার পথ অতিক্রম করলে সামনের চাকা পেছনের চাকার চেয়ে ১০০ বার বেশি ঘুরবে?
- The measure of the side of a square is tripled. If x represents the perimeter of the original square , what is the value of the new perimeter?
- A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 5 feet long. If a certain fence begins and ends with a post, which of the following could be the length of the fence in feet? (12 inches = 1 foot). Indicate ALL such answers.
- A tap can fill a tank in 4 hours. After half the tank is filled, three taps that are more similar are opened. What is the total time taken to fill the tank completely?
- A car completes a journey in 11 hours, the first half at 30 km/hr and the second half at 25 km/hr. Find the distance travelled?
- A trader normally makes a profit of 40% on items he sells. If he reduces the price by 10%, his sales increase by 40%. Let x be the total profit when he does not reduce the price, and y the total profit when he reduces the price. What is the ratio of y to x?
- তিনটি মেশিন একটি কাজ যথাক্রমে ৪, ৬ এবং ৮ ঘণ্টায় সম্পন্ন করতে পারে। দুইটি মেশিন সর্বোচ্চ ক্ষমতায় কাজ করে এক ঘণ্টায় কতটুকু কাজ করতে পারবে?