যদি আমরা একটি সংখ্যার 5 গুণের সাথে 7 যোগ করি, তবে আমরা 67 পাই এবং আমরা যদি একই সংখ্যার তিনগুণ থেকে 9 বিয়োগ করি তবে আমরা 27 পাই। প্রদত্ত সংখ্যাটি নির্ণয় করুন।

  1. 65
  2. 12
  3. 67
  4. 15

Answer (Detailed Solution Below)

Option 2 : 12
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Detailed Solution

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ধরা যাক, সংখ্যা = x

প্রশ্ন অনুসারে,

5x + 7 = 67     

⇒ 5x = 60

⇒ x = 12      ---(i)

3x - 9 = 27     

⇒ 3x = 36

⇒ x = 12     ----(ii)

উভয় সমীকরণ সমাধান করে, আমরা পাই  x = 12 

সুতরাং, সঠিক উত্তর হল 12

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