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