Question

One CD player is 3 times as much as another. Together the two CD players would be $320. What is the price of the more expensive CD player?

Answer 1

a = 3*b
a + b = 320

You substitute and get:
3b + b =320, so b = 80, and therefore a = 320 - 60 = 180

The most expensive one costs 180$

Answer 2

240$

Answer 3

Oops ^^ sorry, I mistyped, i meant a = 320 - 80 = 240