Calculate: (1)/(4)+(9)/(10)+(1)/(5)

Expression: $\frac{ 1 }{ 4 }+\frac{ 9 }{ 10 }+\frac{ 1 }{ 5 }$

Write all numerators above the least common denominator $20$

$\frac{ 5+18+4 }{ 20 }$

Calculate the sum of the positive numbers

$\begin{align*}&\frac{ 27 }{ 20 } \\&\begin{array} { l }1 \frac{ 7 }{ 20 },& 1.35\end{array}\end{align*}$