A, B और C का औसत वजन 45 किग्रा है। यदि A और B का औसत वजन 40 किग्रा है तथा B और C का औसत वजन 42 किग्रा है, तो B का वजन (किग्रा में) है:

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 09 Jun, 2025 Shift 1)
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  1. 19
  2. 44
  3. 29
  4. 39

Answer (Detailed Solution Below)

Option 3 : 29
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दिया गया है:

A, B, C का औसत वजन = 45 किग्रा

A और B का औसत वजन = 40 किग्रा

B और C का औसत वजन = 42 किग्रा

प्रयुक्त सूत्र:

औसत = (मानों का योग) ÷ (मानों की संख्या)

गणना:

⇒ A + B + C = 45 × 3 = 135

⇒ A + B = 40 × 2 = 80

⇒ B + C = 42 × 2 = 84

अब, (A + B) और (B + C) को जोड़ें:

⇒ A + 2B + C = 80 + 84 = 164

हमारे पास पहले से ही है: A + B + C = 135

⇒ घटाएँ:

(A + 2B + C) − (A + B + C) = 164 − 135

⇒ B = 29

∴ B का वजन 29 किग्रा है।

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