কোনো বৃত্তের ব্যাসার্ধ যদি ২০% কমে, তবে উক্ত বৃত্তের ক্ষেত্রফল কত % কমবে ----
A. ১০%
B. ২০%
C. ৩৬%
D. ৪০%
সঠিক উত্তরঃ
C.
৩৬%
Explanation:
Related Questions (Any University/Year)
- P, Q, and R start a business. P invests 3 times as much as Q invests and Q invests 2/3 rd as much as R invests . Find the ratio of capitals of P, Q and R?
- If 8+ √k=15, then k = ?
- The price of a laptop was sold at 10% discount on the price. If the profit is Tk. 2400 what was the cost of the laptop is TK?
- কাগজের প্রতি পাতা বিক্রি হয় ২১ পয়সায়। চার পাতা কত পয়সায় বিক্রি হবে।
- 3 persons A,B, C whose salaries together amount Tk 7200 ,spend 80%, 85% and 75% of their salaries respectively .If their savings are 8:9:20 .Find salary of B
- Thirty percent of the members of a swimming club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not. How many members are there in the swimming club?
- What is 0.04 x 0.032 in terms of percent?
- Three business people wish to invest in a new company. Each person is willing to pay one third of the total investment. After careful calculations, they realize that each of them would pay BDT 7,200 less if they could find two more equal investors. How much is the total investment in the new business?
- If the product of two numbers is 10 and sum of the two numbers is 7, which is the larger of the two numbers?
- 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?
- In a basket of fruits ,the ratio of number of apples ,bananas and oranges is 3:4:8 .If the number of apples is 9 ,how many bananas does the basket have?
- In the figure above area of the inscribed rectangle is 32. The circumference of the circle is-
- If x # 0, then (x+7)/7x-1/x=?
- If 7x - 5y = 13 and 2x7y: = 26, then 9x -12y=?
- একটি কুকুর একটি খরগোশকে ধরার জন্য তাড়া করে। কুকুর যে সময়ে ৪ বার লাফ দেয়, খরগোশ সে সময়ে ৫ বার লাফ দেয়। কিন্তু খরগোশ ৪ লাফে যতদূর যায়, কুকুর ৩ লাফে ততদূর যায়। কুকুর ও খরগোশের গতিবেগের অনুপাত কত?
- 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 manufacturer prints books at a cost of Tk. x each for the first thousand copies printed. The second thousand copies printed cost Tk. 0.9x each. If it costs Tk.3,264 to print 1,400 copies of a book, then x is:
- A river boat travels upstream at 6 km/h and returns downstream at 9 km/h. What is the average speed for the round-trip?
- Fresh watermelon contains 90% water by weight whereas dry watermelon contains 20% water by weight. Ben buys 64 kg of fresh watermelon for 160\$. At what price should Ben sell the dry watermelon to get a profit of 20%.
- Mr. Karim traveled from A to B at a speed of 3 km/hr and returned from B to A at a speed of 5 km/hr. the round trip required 8 hours what was the distance between A and B in km?
- How many balls had A given to C?
- If X and odd negative integer and Y is an even position integer then XY must be------.
- Rabib has x more marbles than Rafi has. Together they have y marbles.Which of the following represents the number of marbles that Rafi has?
- Three friends - Anwar, Bobby and Dipu divided Tk. 1105 amongst them in such a way that if Tk. 10, Tk. 20 and Tk. 15 were removed from the amount that Anwar, Bobby and Dipu received respectively, then the share of the amount they got would be in the ratio of 11: 18: 24. How much did Dipu receive?
- What is 10% of of 20% of 30%?