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The common denominator of the two fractions is: 60

$ \frac{2}{15 }= \frac{(2*4)}{(4*15)} =\frac{ 8}{60} $

$ \frac{1}{20 }= \frac{(1*3)}{(3*20)} =\frac{ 3}{60} $

Fractions adjusted to a common denominator

$ \frac{2}{15 }-\frac{ 1}{20 }=\frac{ 8}{60 }-\frac{ 3}{60} $

$ \frac{8}{60 }-\frac{ 3}{60 }= \frac{(8-3)}{60} $

$ \frac{(8-3)}{60 }=\frac{ 5}{60} $

$ \frac{5}{60 }=\frac{ 1}{12} $

$ $

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