Contemporary Mathematics for Business & Consumers 8th Edition by Robert Brechner,Geroge Bergeman

Exercise 73

Set up and solve equations for the following business situations.
An online store sells two types of speaker clocks for smart phones. The higher-priced speaker dock sells for $190 and the lower period speaker dock sells for $80. Last week the store sold three times as many lower period speaker docks as higher-priced speaker docks. Combined sales totaled $3.440. How many of each did it sell