1200 men have provisions for 18 days. If 450 more men join them, for how many days will the provisions last now?	Choices
A) 12.9
B) 12.0
C) 12.5
D) 12.2
E) 13.1

Rationale: "1200 * 18 = 1650 * x x = 13.1 answer : e"
Answer: E