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?
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.
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