1. $x$ is 30% less than 300, $y$ is 30% more than $x$, then $x+y=$
【Solution】Solution: $300 \times(1-30\%)$
$$
\begin{array}{l}
=300 \times 0.7 \\
=210 \\
210 \times(1+30\%) \\
=210 \times 1.3 \\
=273 \\
210+273=483
\end{array}
$$

Answer: $x+y=483$;
Therefore, the answer is: 483.