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( )2 + (18)2 125 = 3 56

This question belongs to Arithmetic Ability Decimal Fraction
Decimal Fraction
?

[(?)2 + (18)2] ÷ 125 = 3.56

Answer & Solution
Correct Answer: Option A
Let, $$\frac{{{x^2} + {{\left( {18} \right)}^2}}}{{125}} = 3.56$$
Then,
$$\eqalign{ & {x^2} + 324 = 125 \times 3.56 = 445 \cr & \Rightarrow {x^2} = 121 \cr & \Rightarrow x = 11 \cr} $$
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