I don't know the answer!

Question

In the lab, Linda has two solutions that contain alcohol and is mixing them with each other. She uses twice as much Solution A as Solution B. Solution A is 14% alcohol and Solution B is 18% alcohol. How many milliliters of Solution B does she use, if the resulting mixture has 230 milliliters of pure alcohol?

Answer 1

2a +b = 230 ml pure alchohol

.14(2x)+ .18(230-x)= 230(1.99)

.10x =230-41.4 = 188.6

x = 1,886 ml of 15%

and 943 ml of 18%

a =14% b= 18%