GRE Problem Solving Question 765

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Source: PP2

A tailor used 30 buttons that had an average (arithmetic mean) weight of x grams per button and 20 other buttons that had an average weight of 80 grams per button. Which of the following is the. average weight per button, in grams, of the 50 buttons that the tailor used?

  • A
  • B
  • C
  • D
  • E

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