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Let L be the liters to be added. Then

(L) x (0.2) + (40 x 0.9) = (L + 40) x 0.6

0.2L + 36 = 0.6L + 24

36 - 24 = (0.6 - 0.2)L

12 = 0.4L

L = 12/0.4 = 120/4 = 30 Liters

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