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Instructions
What approximate value will come in place of the question mark (?) in the given questions? (You are not expected to calculate the exact value.)
Solution
Expression : $$\sqrt ?$$ x 479.87 ÷ 12.01 = 179 + 139.99
=> $$(\sqrt{x}) \times \frac{480}{12} = 180 + 140$$
=> $$\sqrt{x} \times 40 = 320$$
=> $$\sqrt{x} = \frac{320}{40} = 8$$
=> $$x = (8)^2 = 64$$
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