After 2 females leave a party there are twice as many males as females. Then 9 males leave the party and there are twice as many females as male. How many females attended the party?
A. 6
B. 8
C. 16
D. 24
E. none of these
Explanation: পার্টিতে মোট 8 জন মহিলা উপস্থিত ছিল। প্রথমে, মহিলাদের সংখ্যাকে F এবং পুরুষদের সংখ্যাকে M ধরা যাক। যদি 2 জন মহিলা চলে যায়, তাহলে মহিলার সংখ্যা হয় (F-2) এবং পুরুষের সংখ্যা হয় M। প্রশ্ন অনুযায়ী, তখন পুরুষদের সংখ্যা মহিলাদের সংখ্যার দ্বিগুণ হয়: \(M=2(F-2)\) এরপর 9 জন পুরুষ চলে গেলে, পুরুষের সংখ্যা হয় (M-9) এবং মহিলাদের সংখ্যা (F-2) অপরিবর্তিত থাকে। প্রশ্ন অনুযায়ী, তখন মহিলাদের সংখ্যা পুরুষদের সংখ্যার দ্বিগুণ হয়: \((F-2)=2(M-9)\) এখন আমরা এই দুটি সমীকরণ সমাধান করব: ১. \(M=2F-4\) ২. \(F-2=2M-18\) সমীকরণ ১ থেকে M-এর মান সমীকরণ ২-এ বসিয়ে পাই: \(F-2=2(2F-4)-18\) \(F-2=4F-8-18\) \(F-2=4F-26\) \(26-2=4F-F\) \(24=3F\) \(F=24/3\) \(F=8\) সুতরাং, পার্টিতে 8 জন মহিলা উপস্থিত ছিল।
Related Questions (Any University/Year)
- 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 ?
- The speed of a motor boat is 20 km/hr. for covering the distane of 15 km the boat took 1 hour more for upstream than downstream. Let speed of the stream be x km/hr, then speed of the motorboat in upstream will be-
- You can now purchase 5 more bananes with tk. 75 due to a reduction in price by 20% Calculate the current price of one dozen of bananas
- 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 also for his son's education, The total he would spend then for his son's education would be Tk. 645. What is the present salary of that person?
- The average age of a man and his son is 20. after 10 years, their age will be in the ratio 2:1. What was the age of the man and his son 5 years ago respectively?
- A And B can run 200m in 22 and 25 seconds respectively. How far is B from the finishing line when A reaches it?
- If the radius of a circle is increased by 6% , then the area of the circle is increased by-
- A certain radio costs a shopkeeper Tk. 64, At what price must he sell it if he is to make a profit of 20% on the selling price?
- A man traveled one-fourth of the total distance of his trip by car . He traveled the remaining distance on foot . The ratio of his walking time to driving time was 15:1 . Calculate the ratio of his driving speed to his walking speed .
- Rokon, Saim and Nafisa had ate at MCafe. Nafisa's meal cost 50% more than Saim's meal and Rokon's meal cost 5/6 as much as Nafisa's meal. If Saim paid Tk. 1000 for his meal, what was their total lunch bill?
- If 12 men can reap 120 acres of land in 36 days, how many acres of land can 54 men reap in 54 days?
- If X and odd negative integer and Y is an even position integer then XY must be------.
- 230+230 +230 +230=
- Alam starts working on a job and works on work. Then babu joins Alam and together they complete the est of the work in 12 days . How long (in days) will it take Babu to complete the job if he works alone ?
- Stan can run 10 miles per hour, whereas Jack can run only 8 miles per hour.If they start at the same time from the same point and run in opposite directions, how far apart( to the nearest Mile) will they be after 10 minutes?
- Out of their annual net income, a couple spent 25 percent for food, 13.5 percent for entertainment, 20 percent for housing, 8 percent for car expenses, 15 percent for clothing, and saved the rest. What was the ratio of the amount saved to the amount spent for entertainment?
- In an excel sheet, there are 5 rows and 5 columns where you can put either 5 or 10 . Suppose the number of 5 s in \(x^{th}\) row of the table is \(x-1\) for each row. What is the arithmetic mean of all the numbers in the table?
- A vendor sells 5 lemons for a taka, to make 40% profit. How many lemons did he buy for a taka?
- 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?
- A can complete a project in 20 days and B can complete the same project and B start working on the project together and A quits 10 days before in 30 days. If A the project is completed, in how many days will the project be completed?