प्रत्येक 9 और 13 से कौन - सी सबसे छोटी धनात्मक संख्या घटाई जानी चाहिए। ताकि उनका तृतीयानुपाती 18 हो?

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SSC CGL 2022 Tier-I Official Paper (Held On : 03 Dec 2022 Shift 3)
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  1. 2
  2. 4
  3. 3
  4. 1

Answer (Detailed Solution Below)

Option 4 : 1
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PYST 1: SSC CGL - General Awareness (Held On : 20 April 2022 Shift 2)
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दिया गया है: 

18 तृतीयानुपाती है।

प्रयुक्त सूत्र:

1. यदि A : B :: C : D है, तो (B × C) = (A × D)

2. (a - b)2 = a2 - 2ab + b2

गणना:

माना सबसे छोटी धनात्मक संख्या Q है।

अनुपात (9 - Q) : (13 - Q) : : (13 - Q) : 18 है।

प्रश्नानुसार,

(13 - Q)2 = (9 - Q) × 18

⇒ 169 + Q2 - 26Q = 162 - 18Q

⇒ Q2 - 8Q + 7 = 0

⇒ (Q - 7)(Q - 1) = 0

इसलिए, सबसे छोटी संख्या = Q = 1

सबसे छोटी संख्या 1 है।

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