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= 21 : 6 = 7 : 3
b. 75 cm :2,5 m = 75 cm : 250 cm = 3 : 10
c. 150 cm : 3 km = 150 cm : 300.000 cm = 1 : 2.000
d. 250 ml : 5 L = 250 ml : 5.000 ml = 1 : 20