SOLUTION: Problem Page A textbook store sold a combined total of 203 history and sociology textbooks in a week. The number of sociology textbooks sold was 47 less than the number of history

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Question 1111491: Problem Page A textbook store sold a combined total of 203 history and sociology textbooks in a week. The number of sociology textbooks sold was 47 less than the number of history textbooks sold. How many textbooks of each type were sold?
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
h + s = 203 subtract s from both sides:
h = 203 - s
s = h - 47 so substitute for s in the first equation above:
h + h - 47 203
2h = 250
h = 125 they sold 125 history books
and sociology?:
s = h - 47 = 125 - 47 = 78 books