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: what will be the percentage increase in the area of the cube ' s surface if each of the cube ' s edges grows by 40 % ?
Options: a. 95 %, b. 90 %, c. 85 %, d. 96 %, e. 25 %
[EX A]: d

[EX Q]: Problem: what is the least number of squares tiles required to pave the floor of a room 15.17 m long and 9.02 m broad ?
Options: ['a. 814', 'b. 266', 'c. 287', 'd. 999', 'e. 661']
[EX A]: a

[EX Q]: 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 ?
Options: a. - 4, b. - 2, c. 15, d. 13, e. 22
[EX A]:
c