Solution
$$ 72 \div \frac{1}{2} $$ { 15 + 12 - (9 + 6 - $$ \overline{5+7}$$ )}
= $$ 72 \div \frac{1}{2}$$ { 15 + 12 - (15 - 12 )}
= $$ 72 \div \frac{1}{2}$$ { 27 - 3 }
= $$ \frac{72}{\frac{1}{2} \times 24}$$
= 6
So , the answer would be option a)6.
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