Answer:
1) 3:2
2) 2:1 cm
3) 1:4 meters
4) 3:2
5) 2:1:3
Step-by-step explanation:
1) 18:12 reduce --> 3:2
2) 30 - 20 = 10 ---> so 20:10= 2:1
3) 6x4= 24 so --> 6:26 reduce 1:4
4) 25-15= 10 so 15 red to 10 blue reduce ---> 3:2
5) 20 yellow 10 blue 30 red reduce---> 2:1:3
