A chemist has three different acid solutions. The first acid solution contains 15
%
acid, the second contains
30
%
and the third contains
70
%
. They want to use all three solutions to obtain a mixture of
180
liters containing
35
%
acid, using
3
times as much of the
70
%
solution as the
30
%
solution. How many liters of each solution should be used?

The chemist should use
liters of
15
%
solution,
liters of
30
%
solution, and
liters of
70
%
solution.