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y = 16,2-1,75= 14,45
z - ?
(x+y+z):3= 12 1/3
(16 1/5+ 14 9/20 + z) : 3 = 12 1/3
(16 4/20 + 14 9/20 +z) : 3 = 12 1/3
(30 13/20 +z) : 3= 12 1/3 || *3
30 13/20 + z = 37
z = 37 - 30 13/20
z = 6 7/20
Odp. Trzecia liczba wynosi 6,35.