Problema Solution
Elena checked out a total of 20 books from the library. She checked out 4 more mystery novels than romance novels, and she checked out 5 less biographies than romance novels. How many of each type of book did Elena check out of the library?
Answer provided by our tutors
Let 'x' represent the number of romance novels that Elena checked.
She checked out 4 more mystery novels than romance novels means: '4 + x' mystery novels
She checked out 5 less biographies than romance novels means: 'x - 5' biographies
Elena checked out a total of 20 books means:
x + (4 + x) + (x - 5) = 20
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click here to see the equation solved for x
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x = 7 romance novels
4 + 7 = 11 mystery novels
7 - 5 = 2 biographies
Elena checked 2 biographies, 7 romance and 11 mystery novels.