math
posted by Anonymous .
the cost of 5 similar digital cameras and 3 similar camaras is 3213.00$. each video camera cost 4 times as much as each digital camera. john buys a digital camera and a video camera. how much does he pay

cost of digital camera  x
cost of video camera  4x
5x + 3(4x) = 3213
17x = 3213
x = 189
take it from there 
Just realized I answered the same question about a year ago
http://www.jiskha.com/display.cgi?id=1350624298