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18 December, 09:15

A textbook store sold a combined total of 207 psychology and biology textbooks in a week. The number of biology textbooks sold was 59 less than the number of psychology textbooks sold. How many textbooks of each type were sold?

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  1. 18 December, 09:58
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    P + b = 207

    p-59 = b

    P + (P-59) = 207

    2p-59=207:

    2p = 207+59

    p=266/2

    P=133

    b=133-59

    b=74

    psych books = 133

    biology books = 74

    74+133 = 207 (Check)
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