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20 divided by one fourth

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\frac { 20 }{ \frac { 1 }{ 4 } } \\ \\ =\frac { 20 }{ 1 } \cdot { \left( \frac { 1 }{ 4 } \right) }^( -1 )


\\ \\ =\frac { 20 }{ 1 } \cdot { \left( \frac { 4 }{ 1 } \right) }^( 1 )\\ \\ =\frac { 20 }{ 1 } \cdot \frac { 4 }{ 1 } \\ \\ =\frac { 80 }{ 1 } \\ \\ =80
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