Question 729100
Let 


x = price of cheaper player

y = price of more expensive player



Since "One CD player is 3 times as much as another", we can say (according to the definition made above)


y = 3x


Together the two CD players would be $320, so x and y must add to 320


x+y = 320


x + 3x = 320 .... plug in y = 3x


4x = 320


Solve for x. Then use it to find y. I'll let you finish up.