1.

1). 21 ∶ 82). 1 ∶ 73). 1511 ∶ 3214). Cannot be determined

Answer»

$(\FRAC{A}{3} = \frac{{3B}}{4} = \frac{{5C}}{6} = \frac{{7D}}{8})$

∴ A ? D = 21 ? 8



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