There is enough provisions for 600 men in an army camp for 35 days. If there were 300 men less, how long will the provision last?	Select the correct option:  A) 40 days  B) 50 days  C) 60 days  D) 70 days  E) 80 days

Rationale: "exp : we have , m 1 d 1 = m 2 d 2 600 * 35 = 300 * d 2 d 2 = 600 * 35 / 300 = 70 days . answer : d"
Answer: D