The task is to generate the correct answer for a given math problem.
--------
Question: Problem: solution y is 30 percent liquid x and 70 percent water . if 2 kilograms of water evaporate from 6 kilograms of solution y and 2 kilograms of solution y are added to the remaining 4 kilograms of liquid , what percent of this new solution is liquid x ?

Answer: 40 %

Question: Problem: a jogger running at 9 kmph along side a railway track is 260 metres ahead of the engine of a 120 metre long train running at 45 kmph in the same direction . in how much time will the train pass the jogger ?

Answer: 38 sec

Question: Problem: when x is multiplied by 2 , the result is 19 more than the result of subtracting x from 26 . what is the value of x ?

Answer:
15