20
(4 + 4 + 4) ÷ 4 = 12 ÷ 4 = 3.
16
4 x 4(4-4) = 4 x 40 = 4 x 1 = 4 or 4 + 4(4-4) = 4 + 4(0) = 4 + 0 = 4
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