The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: after decreasing 24 % in the price of an article costs rs . 684 . find the actual cost of an article ?
[EX A]: 900

[EX Q]: Problem: a solution of 70 litres contains oil and water in the ratio 9 : x . if 6 litres of water is added to the solution , the ratio becomes 6 : 4 , find the value of x ?
[EX A]: 

[EX Q]: Problem: a part - time employee ’ s hourly wage was increased by 10 % . she decided to decrease the number of hours worked per week so that her total income did not change . by approximately what percent should the number of hours worked be decreased ?
[EX A]:
9 %