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The Question:

one day, Kwon's grocery store sold 70 bars of soap, some for $.85,some with a 25-cent off coupon for $.60. A total of $50 was taken in from the sale of bars of soap, but the cashier lost the coupons. How many bars of soap were sold with coupons?

—divine_Dei, December 08, 2001

Your Answer:

This is a problem involving simultaneous equations. You have two unknowns and two equations to solve for them.

Here are 3 example problems similar to this one from the Dr. Math website algebra forum:
Solving Simultaneous Equations and Factoring
Simultaneous Equations
Simultaneous Equations and the Addition Method

To get you started, here are the two equations you need to solve:
A = number of regular price bars
B = number of discount bars
A + B = 70
0.85A + 0.60B = 50

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