The task is to generate the correct answer for a given math problem.

Problem: if 5 a = 3125 , then the value of 5 ( a - 3 ) is :
25

Problem: . 005 / ? = . 01
. 5

Problem: a garrison of 400 men had a provision for 31 days . after 26 days 275 persons re - enforcement leave the garrison . find the number of days for which the remaining ration will be sufficient ?

16 days