A textbook store sold a combined total of 411 psychology and history textbooks in a week. The number of history textbooks sold w
as 69 less than the number of
psychology textbooks sold. How many textbooks of each type were sold?
1 answer:
Answer:
Step-by-step explanation:
h and p are the number of history and psych textbooks, respectively.
store sold a total of 411 textbooks in a week.
h + p = 411
The number of history textbooks sold was 69 less than the number of psychology textbooks sold.
h = p - 69
Substitution
(p-69) + p = 411
2p = 411+69
p = 240
h = p-69 = 171
171 history books and 250 psych books
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