\[\frac{a}{b} = 10 \Longrightarrow \frac{b}{a} = \frac{1}{10} = 0,1 \Longrightarrow a =\]
\[= 10b\]
\[\frac{a + b}{a} = \frac{10b + b}{10b} = \frac{11b}{10b} = 1,1\]