Question : Simplify the following expression: [$\sqrt{25}$ + 12 ÷ 3 – {20 + (16 of 8 ÷ 16) – (54 ÷ 18 of $\frac{1}{2}$}]
Option 1: –13
Option 2: 12
Option 3: 22
Option 4: 0
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Correct Answer: –13
Solution : [$\sqrt {25}$ + 12 ÷ 3 – {20 + (16 of 8 ÷ 16) – (54 ÷ 18 of $\frac{1}{2}$)}] = [5 + 12 ÷ 3 – {20 + (128 ÷ 16) – (54 ÷ 9)}] = [5 + 12 ÷ 3 – {20 + 8 – 6}] = [5 + 12 ÷ 3 – 22] = [5 + 4 – 22] = [5 + 4 – 22] = 9 – 22 = –13 Hence, the correct answer is –13.
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