যদি দুটি সংখ্যার অনুপাত 5 : 3 হয় এবং তাদের ল.সা.গু. ও গ.সা.গু.-এর গুণফল 135 হয়, তাহলে ল.সা.গু. ও গ.সা.গু.-এর পারস্পরিক যোগফল হল:

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 05 Jun, 2025 Shift 1)
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  1. \(\frac{16}{73}\)
  2. \(\frac{16}{85}\)
  3. \(\frac{16}{45}\)
  4. \(\frac{16}{61}\)

Answer (Detailed Solution Below)

Option 3 : \(\frac{16}{45}\)
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Detailed Solution

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প্রদত্ত:

দুটি সংখ্যার অনুপাত = 5:3

ল.সা.গু. ও গ.সা.গু.-এর গুণফল = 135

ব্যবহৃত সূত্র:

ল.সা.গু. x গ.সা.গু. = সংখ্যাগুলির গুণফল

গণনা:

সংখ্যাগুলি = 5x এবং 3x

সংখ্যাগুলির গুণফল = 5x x 3x = 15x2

⇒ ল.সা.গু. x গ.সা.গু. = 15x2 = 135

⇒ x2 = 135/15

⇒ x2 = 9

⇒ x = 3

সংখ্যাগুলি = 5x = 15, এবং 3x = 9

15 এবং 9 এর ল.সা.গু. = 45

15 এবং 9 এর গ.সা.গু. = 3

ল.সা.গু. এবং গ.সা.গু.-এর পারস্পরিক যোগফল = (1/ল.সা.গু.) + (1/গ.সা.গু.)

⇒ যোগফল = (1/45) + (1/3)

⇒ যোগফল = 16/45

∴ সঠিক উত্তর হল বিকল্প (3)।

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