There is enough provisions for 2400 women in an army camp for 100 days. If there were 1200 men less, how long will the provision last?	Choose the correct choice:
A) 170
B) 180
C) 190
D) 200
E) 210

Rationale: "we have , m 1 d 1 = m 2 d 2 2400 * 100 = 1200 * d 2 d 2 = 2400 * 100 / 1200 = 200 days . answer : d"
Answer: D