reduce this ratios to lowest terms
1)10:12
a2:6 b5:6 c4:6 3:6
2)9 is to 15
a 3 is to 3 b 4 is to 3 c 3 is to 5 d 5 is to 3
3)18:24
a6:7 b3:4 c6:8 d9:12
4)21 is to 27
a3 is to 9 b 3 is to 7 c7 is to 9 d 3 is to 4
5)40/50
a 4/5 b 10/5 c 4/10 d 5/4​