question: Paul has 52 marbles. His friend gave him 28 marbles. Then, he lost 1/4 of his marbles. How many marbles does Paul have left?
answer: Paul has a total of 52 + 28 = <<52+28=80>>80 marbles.
  He lost 1/4 x 80 = <<80/4=20>>20 marbles.
  Therefore, he has 80 - 20 = <<80-20=60>>60 marbles left.
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