There is enough provisions for 100 girls in a hostel for 50 days. If there were 20 men less, how long will the provision last? Options:
A) 250  B) 255  C) 260  D) 265  E) 270

Rationale: we have , m 1 d 1 = m 2 d 2 100 * 50 = 20 * d 2 d 2 = 100 * 50 / 20 = 250 days . answer : a
Answer: A