Remove part of a mixture and replace it (once or repeatedly): new concentration

1. A.
   $11 : 7$
2. B.
   $23 : 12$
3. C.
   $17 : 11$
4. D.
   $19 : 12$

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1. A.
   18:1
2. B.
   89:14
3. C.
   81:19
4. D.
   18:17

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1. A.
   $2:1$
2. B.
   $2:3$
3. C.
   $3:1$
4. D.
   $3:2$

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1. A.
   $20\%$
2. B.
   $24\%$
3. C.
   $28\%$
4. D.
   $32\%$

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1. A.
   $76.8\%$
2. B.
   $78.4\%$
3. C.
   $81.6\%$
4. D.
   $71.2\%$

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1. A.
   $44.8\%$
2. B.
   $51.2\%$
3. C.
   $53.7\%$
4. D.
   $56.8\%$

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1. A.
   $34\%$
2. B.
   $35\%$
3. C.
   $36\%$
4. D.
   $37\%$

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1. A.
   1:1
2. B.
   13:7
3. C.
   13:5
4. D.
   5:3

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