Answer :

[tex]\frac { 4 }{ 3 } v=12\\ \\ \frac { 3 }{ 4 } \cdot \frac { 4 }{ 3 } v=\frac { 3 }{ 4 } \cdot 12\\ \\ v=\frac { 36 }{ 4 } \\ \\ v=9[/tex]
4/3v = 12
3/4 × 4/3v = 12 × 3/4
v = 9

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