The greatest number of flowers in each group is 20.
In order to determine the greatest number number of flowers in each group, the highest common factor of 100 roses and 60 daises have to be determined.
The factor of a number is a number that divides a number perfectly into whole numbers. The highest common factor is the highest factor that is common to two or more numbers
Factors of 100 = 1, 2, 4, 5, 10, 20, 25, 50 and 100.
Factors of 60 = 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60.
Common factors of 100 and 60 - 1, 2, 5, 10, 20
Highest common factor = 20
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