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Can someone help me with 11 and 12

Can someone help me with 11 and 12-example-1
User Pptang
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Answer:

see below

Explanation:

11: write 3 equiv ratio of 1:3, so it' could be 3:9, 2:6, 4:12

12. 20:15 = 4:3, 12:9, 8:6

User Pseudonymous
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