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Multiple choice general knowledge math & puzzles

Farmer Charlie has a chicken farm. On a certain day, Charlie calculates in how many days he will run out of chicken-food. He notices that if he would sell 75 of his chickens, he could feed the remaining chickens twenty days longer with the chicken-food he has, and that if he would buy 100 extra chickens, he would run out of chicken-food fifteen days earlier. How many chickens does farmer Charlie have?

  1. 300

  2. 299

  3. 301

  4. 298
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