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Reduce these ratios to lowest terms.
1) boys to 20 pupils
2) 2 story books to 10 children
3) 12 roses to 3 vases
4) 20 garbage cans to 10 classroom
5) 3 balls to 3 boys
6) 20:15
7) 100:50
8) 56:8
9) 15:06
10) 3:21​