What approximate value should come in place of the question mark (?) in the following equation

[√(4000)] × 0.8 = (?)^{2}

- 1
- 7
- 2
- 1.17
- None

Option 2 : 7

Let's discuss the concepts related to Simplification and Percentage. Explore more from Quantitative Aptitude here. Learn now!

⇒ √(4000) × 0.8 = x^{2}

⇒ 20√10 × 0.8 = x^{2}

⇒ 20 × 3.16 × 0.8 = x^{2}

⇒ x^{2} = 50.596 ≈ 51

⇒ x = √51 = 7.14 ≈ 7

∴ Approx value is 7
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