Find the value of $$309 \div \left[\left(\frac{3}{2}\right) \text{of} \left(25 + 35\right) - 12 \frac{3}{4}\right]$$
$$309\div\left[\left(\frac{3}{2}\right)\text{of}\left(25+35\right)-12\frac{3}{4}\right]=309\div\left[\left(\frac{3}{2}\right)\text{of}Â 60-\frac{51}{4}\right]$$
$$=309\div\left[\frac{3}{2}\times60-\frac{51}{4}\right]$$
$$=309\div\left[90-\frac{51}{4}\right]$$
$$=309\div\left[\frac{309}{4}\right]$$
$$=4$$
Hence, the correct answer is Option A
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