Practice Test Discussion

$\sqrt{(5) \times \sqrt{(1600) \times \sqrt{(1024)}}} = 28 \div 7 \times x$

[RBI, 2015]

Explanation

Here,

$= \sqrt{(5) \times \sqrt{(1600) \times \sqrt{(1024)}}} = 28 \div 7 \times x = \sqrt{5 \times \sqrt{16000 \times 1024}} = 4 x = \sqrt{5 \times 1280} = 4 x = 8 \times 10 = 4 x = x = 20$

Hence, Option D is correct.

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