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Fill each blank with the correct number that will make it an equivalent ratio.

1. 2 : 3 = ____ : 24

2. 21 : ____ = 3 : 19

3. 90 : 45 = ____ : 1

4. 7 : 24 = 21 : _____

5. 4 : 7 = 20 : ____​