দুটি সংখ্যার দ্বিগুণের মধ্যে পার্থক্য তাদের যোগফলের সমান। যদি একটি সংখ্যা 15 হয় তবে অন্য সংখ্যাটি নির্ণয় করুন। 

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NTPC Tier I (Held On: 30 Mar 2016 Shift 3)
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  1. 15
  2. 10
  3. 5
  4. 20

Answer (Detailed Solution Below)

Option 3 : 5
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Detailed Solution

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ধরা যাক সংখ্যাগুলি হ'ল x এবং y 

প্রদত্ত তথ্য থেকে, আমরা পাই

⇒ 2 (x - y) = x + y

প্রদত্ত একটি সংখ্যা  x = 15

⇒ 2 (15 - y) = 15 + y

⇒ 30 - 2y = 15 + y

⇒ 15 = 3y

⇒ y = 5
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