5 : 6 অনুপাতের উভয় পদ থেকে ক্ষুদ্রতম পূর্ণসংখ্যাটি বিয়োগ করলে যে অনুপাত পাওয়া যাবে তা 17 : 22 এর চেয়ে কম হবে। সেই ক্ষুদ্রতম পূর্ণসংখ্যাটি নির্ণয় করুন।

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  1. 5
  2. 3
  3. 2
  4. 4

Answer (Detailed Solution Below)

Option 3 : 2
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
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Detailed Solution

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প্রদত্ত:

প্রাথমিক অনুপাত = 5 ∶ 6

চূড়ান্ত অনুপাত 17 ∶ 22 এর চেয়ে কম হওয়া উচিত।

গণনা:

ধরি, বিয়োগ করার জন্য প্রয়োজনীয় ক্ষুদ্রতম পূর্ণসংখ্যাটি হল a

প্রশ্ন অনুসারে,

(5 - a)/(6 - a) < 17/22

⇒ 5 × 22 - 22a < 17 × 6 - 17a 

⇒ 110 - 22a < 102 - 17a

⇒ 110 - 102 < - 17a + 22a

⇒ 8 < 5a

⇒ 8/5 = 1.6 < a

∴ ক্ষুদ্রতম পূর্ণসংখ্যাটি 2 হতে হবে।

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