a garrison of 300 men had a provision for 31 days . after 28 days 280 persons re - enforcement leave the garrison . find the number of days for which the remaining ration will be sufficient ?
"400 - - - 31 400 - - - 3 120 - - - ? 300 * 3 = 20 * x = > x = 45 days answer : a"
divide(multiply(subtract(31, 28), 300), 280)