SOLUTION: A textbook store sold a combined total of
413
psychology and math textbooks in a week. The number of math textbooks sold was
55
less than the number of psychology textbooks
Algebra.Com
Question 971593: A textbook store sold a combined total of
413
psychology and math textbooks in a week. The number of math textbooks sold was
55
less than the number of psychology textbooks sold. How many textbooks of each type were sold?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A textbook store sold a combined total of 413 psychology and math textbooks in a week.
The number of math textbooks sold was 55 less than the number of psychology textbooks sold.
--------------------
How many textbooks of each type were sold?
Equations:
p + m = 413
m = p-55
--------------------
Substitute for "m" and solve for "p"::
p + p-55 = 413
------
2p = 468
----
p = 234 (# of psychology books)
------
m = p-55 = 179 (# of math books)
----------------
Cheers,
Stan H.
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