11. (7 points) A refrigerator factory needs to produce 1590 refrigerators. It has already been producing for 12 days, with 80 units produced each day. The remaining units will be produced at a rate of 90 units per day. How many more days are needed to complete the task?
$$
\begin{array}{l}
\text { [Solution] Solution: }(1590-80 \times 12) \div 90 \\
=(1590-960) \div 90 \\
=630 \div 90 \\
=7 \text { (days) }
\end{array}
$$

Answer: It will take 7 more days to complete the task.
$$