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(125 - 75 ÷ 3 of 5) ÷ 2 + 4 of 12 ÷ 3 - 16 of 5 ÷ 20 = (125 - 75 ÷ 15) ÷ 2 + 48 ÷ 3 - 80 ÷ 20 = (125 - 5) ÷ 2 + 16 - 4 = 120 ÷ 2 + 12 = 60 + 12 = 72 Hence, option a.
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