Asked by Joci

I got an answer by trial and error but need to know how to set the problem up. Bob bought 10 movies for $153. The DVDs were $12 and the BluRays were $23. How many of each did Bob buy? 7 DVDs and 12 BluRays. Thank you for help.
Answered by rbowh
Yes, 7 DVDs but only 3 BRs. Remember there a total of 10 movies were bought.
Answered by Joci
Ok. I thought I had it figured out. I think I typed it wrong. Is there a way to set it up to figure it out?
Answered by rbowh
here's how

DVD + BR = 10 and
12 X DVD + 23 X BR = 153
solve first equation for BR in terms of DVD
then substitute in the second equation
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