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5 1/2 - 1 1/3 = 5 3/6 - 1 2/6 = 4 1/6
11.
1/2 l + 2/5 l + 1/6 l = 15/30 l + 12/30 l + 5/30 l = 32/30 l = 1 2/30 l = 1 1/15 litra
Odp: Powstanie 1 1/15 litra napoju.
12.
22 1/5 l - 8 1/4 l = 22 4/20 l - 8 5/20 l = 21 24/20 l - 8 5/20 = 13 19/20 litra
Odp: W zbiorniku pozostało 13 19/20 litra.
w drugim 1 l
13 0,1 w trzecim