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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
Rounding off the decimals to the nearest whole number and calculating the result would give an answer close to the actual answer.
$$12^2 = 144$$
$$16^2 = 256$$
$$12^2 + 16^2 = 144 + 256 = 390 $$
Let the unknown term be x.
$$x^2 \times 4^2 = 390$$
$$x^2 = \frac{390}{16}$$
$$ x^2 \approx 24$$
$$x \approx 5$$
Hence Option D is the correct answer.
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