After this week, Michelangelo will have 28-12=<<28-12=16>>16 more ceilings to paint.

Next week, Michelangelo will paint 12/4=<<12/4=3>>3 ceilings.

Michelangelo will have 16-3=<<16-3=13>>13 more ceilings to paint.

# Answer

13
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Michelangelo has 28 ceilings to paint. This week, he paints 12 of them. Next week, he will paint 1/4 the number of ceilings he did this week. How many ceilings will be left to paint after next week?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
13
Michelangelo has 28 ceilings to paint. This week, he paints 12 of them. Next week, he will paint 1/4 the number of ceilings he did this week. How many ceilings will be left to paint after next week?
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