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A textbook store sold a combined total of 315 physics and chemistry textbooks in a week. The number of physics textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?

  • math - ,

    Let x = the number of chemistry textbooks.

    x + 2x = 315

    3x = 315

    x = 105

  • math - ,

    p + c = 315
    p =2c

    Replace p with the 2c in the first equation.

    2c + c = 315

    solve for "c"

    then you can find p.

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