Joe has roses enough to make bunches 5,10 or 25 roses with none left over. What is the smallest num?

The question is wonky because we have to assume that it means bunches all the same size. We are not supposed to assume anything in math.

It can't be 25 because that divides into two bunches of 10 with 5 left over.

It can't be 40 because that divides into one bunch of 25 with 15 left over.

It has to be 50 because that can be divided into ten bunches of 5, five bunches of 10, or two bunches of 25.

It can't be 100 because we already found a smaller number.