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What approximate value should come in place of the question mark ‘?’ in the following question? 

(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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Detailed Solution

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Approximating the numbers in the above expression:

⇒ (1800 + √? × 30) ÷ 15 = 144

⇒ 1800 + √? × 30 = 144 × 15 = 2160

⇒ √? × 30 = 2160 – 1800 = 360

⇒ √? = 360/30 = 12

∴ ? = 122 = 144
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