"Three plots with three numbers, leaving 1 at last", "four plots with four numbers, leaving 1 at last" and "five plots with five numbers, leaving 1 at last" mean the number of peaches divided by three, four and five, leaving 1 at last. Because 3, 4 and 5 are coprime, such numbers can only be multiples of 3×4×5=60 plus 1, that is, 6 1, 12 1, 18 1, 24/. ...