math equation probem, help me please!!!!

[breakitoff]

first problem:
Buying tapes and cd's:
Five tapes=2cds at the tape and cd exchange.
Carla bought 4 tapes and 2 cds for $27. How much does a cd cost?
need the equation, thanks!!

:?:

 

[stapel]

If two CDs cost as much as five tapes, then to how many tapes is "four tapes and two CDs" equivalent?

Since the total cost was $27, then how much does each tape cost?

Then how much do five tapes cost?

Then how much do two CDs cost?

Then how much does one CD cost?

If you get stuck, please reply showing all of your steps so far. Thank you!

Eliz.