How many liters of each solution should be used?

Question

A chemist has three different acid solutions. The first acid solution contains  acid, the second contains  and the third contains . He wants to use all three solutions to obtain a mixture of  liters containing  acid, using  times as much of the  solution as the  solution. How many liters of each solution should be used?

Answer 1

x represents the amount of 30%

2x represents the amount of 80%

162 - 2x represents the amount of 20%

0.3x + 0.8(2x) + 0.2(162 - 2x) = 0.3(162)

Can you solve for x and answer?