Answer: 4 : 15
Explanation:
The unit ratio of 2 : 8 is 1 : 4
The unit ratio of 5 : 20 is 1 : 4
The unit ratio of 3 : 12 is 1 : 4
However, the unit ratio of 4 : 15 is 4 : 15
Hope this helped!
number one because if you do the math it's the o nly one that's different
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