which two ratio form a proportion? check the blank before the number of two ratios that form a proportion and across-out that are not.
____1. 1:2=2:4
____2. 6:5=30:25
____3. 5:4=10:4
____4. 5:2=10:4
____5. 5:3=9:15
____1. 1:2=2:4
____2. 6:5=30:25
____3. 5:4=10:4
____4. 5:2=10:4
____5. 5:3=9:15
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Brainliest please? Thanks