Q: 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?
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A: 12/4 = <<12/4=3>>3 slices of cake were eaten by Lovely's visitors.
So, 12 - 3 = <<12-3=9>>9 slices of cake were kept. The answer is  9.
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