One day work of 14 Indians and 8 Chinese = 1/8 One day work of 14 Japnese and 6 Chinese = 1/14 Therefore, one day’s work of 14 Indian, 14 Chinese and 14 Japanese = 1/8 + 1/14 = (7 + 4)/56 = 11/56 Therefore, one day’s work of 1 Indian, 1 Chinese and 1 Japanese = 11/56 × 1/14 = 11/784 Therefore, number of days required by 1 Indian, 1 Chinese and 1 Japanese = 784/11 = 71*3/11 days