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10/30=1/3
b
12,5/5=2,5
c
2,1/1,4=3/2
d
3/5
e
42/1,2=35
f
1,75/3,5=1/2
2
5:8
5x+8x=5,2
13x=520 cm
x=40 cm
5x=200 cm
8x=320 cm
200cm i 320 cm