human
Lovely cuts her birthday cake into 12 equal pieces. Only one-fourth of the cake was eaten by her visitors and the rest were kept. How many slices of cake were kept?
assistant
How many slices of cake were eaten? ** 12/4 = <<12/4=3>>3 slices of cake were eaten by Lovely's visitors.
How many slices of cake were kept? ** So, 12 - 3 = <<12-3=9>>9 slices of cake were kept.
#### 9