1500 men have provisions for 17 days. If 320 more men join them, for how many days will the provisions last now?
Choose the correct choice from the following options:
A) 12.9	B) 12.0	C) 14	D) 15	E) 16

Rationale: "1500 * 17 = 1820 * x x = 14 answer : c"
Answer: C