निम्नलिखित प्रश्न में प्रश्न चिह्न ‘?’ के स्थान पर अनुमानित मान क्या आयेगा?

(1800 + √? × 29.99) ÷ 15.02 = 144

  1. 12
  2. 25
  3. 625
  4. 144
  5. 196

Answer (Detailed Solution Below)

Option 4 : 144
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उपरोक्त समीकरण के सभी मानों का सन्निकट मान लिखने के बाद:

⇒ (1800 + √? × 30) ÷ 15 = 144

⇒ 1800 + √? × 30 = 144 × 15 = 2160

⇒ √? × 30 = 2160 – 1800 = 360

⇒ √? = 360/30 = 12

∴ ? = 122 = 144
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