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

[EX Q]: Problem: by selling an article for $ 225 a person gains $ 75 . what is the gain % ?
[EX A]: 50 %

[EX Q]: Problem: find the area of trapezium whose parallel sides are 20 cm and 18 cm long , and the distance between them is 10 cm ?
[EX A]: 190 cm 

[EX Q]: Problem: the length of a rectangular floor is more than its breadth by 100 % . if rs . 600 is required to paint the floor at the rate of rs . 3 per sq m , then what would be the length of the floor ?
[EX A]:
14.4 m .