$$\sqrt{3969}$$ $$\div$$ 1.4 = ? $$\times$$ 2.5
Let the unknown quantity be $$'x'$$.
$$\sqrt{3969}\div1.4 = x\times2.5$$.
$$63\div1.4=x\times2.5$$.
$$x=45\div2.5$$.
$$x=18$$.
Hence, Option A is correct.
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