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Solve frac 529 = frac 329

This question belongs to Arithmetic Ability Decimal Fraction
Decimal Fraction
?

Solve $$\frac{?}{529}$$ = $$\frac{329}{?}$$

Answer & Solution
Correct Answer: Option E
Let the missing number be x,
$$\frac{x}{529}$$ = $$\frac{329}{x}$$
x × x = 529 × 329
x = $$\sqrt {174041} $$
x = 417.18 $$ \approx $$ 416
Hence, the number is 416
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