G9.2 If $x=1.9 \dot{8} \dot{9}$ and $x-1=\frac{K}{99}$, find $K$.
G9.3 The average of $p, q$ and $r$ is 18. The average of $p+1, q-2, r+3$ and $t$ is 19. Find $t$.
$\begin{array}{l}x=1.9+\frac{89}{990} \\ x-1=\frac{K}{99}=\frac{9}{10}+\frac{89}{990} \\ \quad=\frac{9 \times 99+89}{990}=\frac{980}{990}=\frac{98}{99} \\ K=98 \\ \frac{p+q+r}{3}=18 \\ \Rightarrow p+q+r=54 \\ \frac{p+1+q-2+r+3+t}{4}=19 \\ \Rightarrow p+q+r+2+t=76 \\ \Rightarrow 54+2+t=76 \\ t=20\end{array}$