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।
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