66.05 
17.95 – 38.99 18.12 = (60+?) 6
66.05 
17.95 – 38.99 18.12 = (60+?) 6 66 18 – 39 18 = (60+?) 6 18 (66 -39) = (60+?) 6 18 27 = (60+?) 6 81 = 60 + ? ? = 81 - 60 = 21 = Approx 20
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