## Task 1

Solve the following equations. The same letters represent the same numbers.

$$
\begin{aligned}
3280+a & =3330 \\
a+b & =200 \\
c: a & =4 \\
a+b+c+d & =500
\end{aligned}
$$
$a=50 ; b=150 ; c=200 ; d=100$