Subject
Bank Exam
Topic
পূবালী ব্যাংক লিমিটেড (সিনিয়র অফিসার) - ৩০.০৯.২০২৩
A positive number, when decreased by 4, is equal to 21 times the reciprocal of the number. The number is:
A positive number, when decreased by 4, is equal to 21 times the reciprocal of the number. The number is:
ক)
3খ)
5গ)
7ঘ)
9Explanation
মনেকরি, সংখ্যাটি = x প্রশ্নমতে, x - 4 = 21/x বা, x(x - 4) = 21 বা, x 2 - 4x - 21 = 0 বা, x 2 - 7x + 3x - 21 = 0 বা, x(x - 7) + 3(x - 7) = 0 ∴ (x - 7)(x + 3) = 0 হয় x - 7 = 0 বা, x = 7 অথবা x + 3 = 0 বা, x = - 3 ∴ সংখ্যাটি = 7Related questions
Which cryptographic algorithm is widely used for securing internet communications, including websites, by providing secure, encrypted connections?কোনটি তদ্ভব শব্দ?Which desert is the largest in the world and spans multiple African countries?কোনটি ব্যাঞ্জনসন্ধির নিয়মে হয়েছে?Which global organization focuses on protecting and promoting children's rights, including the right to education and healthcare?শব্দ মধ্যস্থিত দুটি সমধ্বনির একটির পরিবর্তনকে বলে -Which open-source operating system in based on the Linux kernel and is known for its security, stability, and use in server environments?কোন শব্দে নিত্য মূর্ধন্য ‘ণ’ আছে?