How many color TV sets were sold?

Question

An appliance dealor sold 40 tv sets during a sale. Some of the sets were black and white models, each selling at $119. The rest were color sets at $319 each. The sale brought in $10,360. How many color sets were sold?

Answer 1

You need two equations. Assume c is the number of color sets sold and b is the number of black and white sets sold.

 

b + c = 40

119*b + 319*c = 10360

 

Now, you can substitute b = 40 - c into the second equation and solve for c. This gives you 28 color sets sold.