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200 cm : 3 dm
= 200 cm : 30 cm
= 200 : 30
= 20 : 3
B
225 ons : 300 kg
225 ons : 3000 ons
225 : 3000
3 : 40
C
20 :350
= 2 : 35
D
1,5kg : 450 g
= 1500 g : 450 g
= 1500 : 40
= 75 : 2