Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[EX Q]: Problem: 50 % of a number is more than 40 % of 120 by 180. find the number ?
Options: a. 456, b. 480, c. 420, d. 445, e. 320
[EX A]: a

[EX Q]: Problem: the dimensions of a room are 10 m x 7 m x 5 m. there are 2 doors and 3 windows in the room. the dimensions of the doors are 1 m x 3 m. one window is of size 2 m x 1.5 m and the other 2 windows are of size 1 m x 1.5 m. the cost of painting the walls at rs. 3 per sq m is
Options: a. 2488, b. 378, c. 739, d. 474, e. 291
[EX A]: d

[EX Q]: Problem: in a certain lottery, the probability that a number between 1 and 15, inclusive, is drawn is 1 / 3. if the probability that a number 1 or larger is drawn is 2 / 3, what is the probability that a number less than or equal to 15 is drawn ?
Options: a. 2 / 3, b. 1 / 3, c. 1 / 4, d. 1 / 6, e. 2 / 5
[EX A]:
a