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A textbook store sold a combined total of 257 math and psychology textbooks in a week. The number of math textbooks sold was 87 more than the number of psychology textbooks sold. How many textbooks of each type were sold?

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sqdancefan

Answer:

  • 85 psychology
  • 172 math

Step-by-step explanation:

Let p represent the number of psychology textbooks sold. Then the total number sold was ...

  p + (p+87) = 257

  2p = 170 . . . . . .subtract 87; next divide by 2

  p = 85 . . . . . . . psychology books sold

  p+87 = 172 . . . math books sold

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