Final answer:
The riddle describes a scenario where each statement on flower color describes exceptions rather than totals, leading to the conclusion that there are three flowers in total: one white, one red, and one yellow.
Step-by-step explanation:
The riddle presents an interesting logic puzzle that can be confusing if taken at face value. The key is to understand that the riddle is describing the number of flowers in a way that each flower color is accounted for in terms of how many flowers are not that color. So, if all flowers are white except two, it means there are two flowers that are not white. Similarly, if all are red except two, it indicates there are two flowers that are not red, and if all are yellow except two, there are two flowers that are not yellow. Since each statement accounts for every flower in the garden except for two, we can infer that there are three flowers in total. One flower each would be white, red, and yellow, each of them being the exception in the other two cases.