SOLUTION: a book seller buys 120 volumes of a certain series of books. he sells some at the published price of Rs. 18 each & disposes of the remainder during a cleaning sale at Rs. 12 each.

Question 917307: a book seller buys 120 volumes of a certain series of books. he sells some at the published price of Rs. 18 each & disposes of the remainder during a cleaning sale at Rs. 12 each. if his total recipts are Rs. 1920. find how many volumes were sold at each price.please help me
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
DEFINING A VARIABLE TO START:
= number of books sold at Rs. 18 each, which makes
= number of books sold at Rs. 12 each.

REASONING:
So,
= money (in Rs.) received from the sale of books at Rs. 18 each;
= money (in Rs.) received from the sale of books at Rs. 12 each,
and = total receipts (in Rs.).
The equation to solve is

SOLVING THE EQUATION:

volumes were sold at Rs. 18 each,
and the remaining volumes were sold at Rs. 12 each.
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