a garrison of 400 men had a provision for 31 days . after 25 days 320 persons re - enforcement leave the garrison . find the number of days for which the remaining ration will be sufficient ?
"400 - - - 31 400 - - - 6 80 - - - ? 400 * 6 = 80 * x = > x = 30 days . answer : b"
divide(multiply(subtract(31, 25), 400), 320)