বর্তমানে A হল B এর থেকে 8 বছরের ছোট। যদি 4 বছর আগে, তাদের বয়সের অনুপাত 1 ∶ 2 হয়, তাহলে B-এর বর্তমান বয়স (বছরে) কত?

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SSC CGL 2021 Tier-I (Held On : 12 April 2022 Shift 1)
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  1. 12
  2. 20
  3. 11
  4. 18

Answer (Detailed Solution Below)

Option 2 : 20
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Detailed Solution

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প্রদত্ত:

A হল B এর থেকে 8 বছরের ছোট

4 বছর আগে, A এবং B এর বয়সের অনুপাত = 1 ∶ 2

গণনা:

ধরা যাক, A এর বর্তমান বয়স = x বছর

সুতরাং, B এর বর্তমান বয়স = (x + 8) বছর

তারপর, (x - 4)/[(x + 8) - 4] = 1/2

⇒ (x - 4)/(x + 4) = 1/2

2x - 8 = x + 4

2x - x = 8 + 4

x = 12

সুতরাং, B এর বর্তমান বয়স = 12 + 8 = 20 বছর

∴  B এর বর্তমান বয়স (বছরে) 20 বছর। 

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