a garrison of 400 men had a provision for 31 days . after 28 days 300 persons re - enforcement leave the garrison . find the number of days for which the remaining ration will be sufficient ?
"400 - - - 31 400 - - - 3 100 - - - ? 400 * 3 = 100 * x = > x = 12 days . answer : e"
divide(multiply(subtract(31, 28), 400), 300)