Question
Ethan had 10% as many cards as Vincent. After Ethan and Vincent bought another 7 cards and 5 cards respectively, Ethan had 80% less cards than Vincent. How many cards did Vincent have at first?
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Ethan had 10% as many cards as Vincent. After Ethan and Vincent bought another 7 cards and 5 cards respectively, Ethan had 80% less cards than Vincent. How many cards did Vincent have at first?