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: the lcm of two numbers is 2310 and hcf is 55. if one of the numbers is 210. then what is the other number ?
Options: a. 715, b. 825, c. 330, d. 605, e. 465
[EX A]: d

[EX Q]: Problem: a man ' s speed with the current is 18 km / hr and the speed of the current is 2.5 km / hr. the man ' s speed against the current is ?
Options: a. 10, b. 18, c. 50, d. 30, e. 40
[EX A]: b

[EX Q]: Problem: if 2994 ã · 14.5 = 179, then 29.94 ã · 1.45 = ?
Options: a. 17.1, b. 17.3, c. 17.5, d. 17.7, e. 17.9
[EX A]:
e