Question: spongebob is really hungry. he attends a party with 400 slices of pizza. when he arrives 50% of the pizza is gone. When he leaves,

spongebob is really hungry. he attends a party with 400 slices of pizza. when he arrives 50% of the pizza is gone. When he leaves, only 10% of the pizza remains. When spongebob was at the party, he was the only being to eat pizza. How many slices of pizza did he eat?

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