As of 2012, the movies with the highest worldwide box-office sales are Avatar, Titanic, and The Avengers. The total box-office sales for all three movies were $6.5 billion. The box-office sales for Avatar were $0.2 billion less than twice the box-office sales for The Avengers. The box-office sales for the Titanic were $0.6 billion less than the box-office sales for Avatar. Determine the box-office sales for each of these movies.
AVA + .2*10^9 = 2 * AVE
T + .6*10^9 = AVA
AVA + AVE + T = 6.5*10^9
============================
do them all in billions
well
T = AVA - .6
AVE = .5 AVA + .2
so
AVA + .5 AVA + .2 + AVA - .6 = 6.5
2.5 AVA = 6.9
take it from there