To solve the equation "_____ divide by 30 = 13", we can rewrite it as:
\( x \div 30 = 13 \)
To find \( x \), multiply both sides by 30:
\( x = 13 \times 30 \)
Calculating this gives:
\( x = 390 \)
Now, we can check if 390 is one of the given options: 330, 360, 390, 420.
Since 390 is included, the correct answer is:
390