Where should parentheses be added to make the following expression true? 100 ÷ 20 - 10 + 8 * 6 + 1 = 66

(100 ÷ 20) - 10 + 8 * 6 + 1 = 66

100 ÷ (20 - 10) + 8 * (6 + 1) = 66

(100 ÷ 20) - 10 + 8 * (6 + 1) = 66

100 ÷ 20 - (10 + 8) * 6 +1 = 66

Answer:
100 ÷ (20 - 10) + 8 * (6 + 1) = 66

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