SOLUTION: Mrs Lee bought 50 books for $50. She paid $4 for each of the big books and$1 for 4 smaller books. How many big books and small books did she buy?

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Question 1090781: Mrs Lee bought 50 books for $50. She paid $4 for each of the big books and$1 for 4 smaller books. How many big books and small books did she buy?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39625)   (Show Source): You can put this solution on YOUR website!
x of the small books
y of the big books

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, and ;




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40 of the small books and 10 of the big books.
Answer by ikleyn(52852)   (Show Source): You can put this solution on YOUR website!
.
A combination of (1 big book plus 4 small books) costs exactly 5 dollars and contains 5 books.


So, 10 times this combination satisfies/satisfy to the condition.


Answer. 10 big books and 4*10 = 40 small books.


I was lasy to write and to solve the problem using the system of equations.
So, I solved it MENTALLY, instead.



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