A garrison of 400 men had a provision for 31 days. After 20 days 180 persons re-enforcement leave the garrison. Find the number of days for which the remaining ration will be sufficient?  Options.
A) 65 days B) 45 days C) 20 days D) 16 days E) 18 days
400 --- 31   400 --- 11   220 --- ?   400*11 = 220*x =&gt; x =20 days.   Answer: 20 days
<result>C</result>
A garrison of 400 men had a provision for 31 days. After 20 days 180 persons re-enforcement leave the garrison. Find the number of days for which the remaining ration will be sufficient?