Answer:
6 groups
Step-by-step explanation:
we need to find the greatest common factor (GCF) of 18 and 30. so lets list all their factors:
18: 1, 2, 3, 6, 9, 18
30: 1, 2, 3, 5, 6, 10, 15, 30
their GCF is 6, so she can make 6 groups. each one will have 3 yellow flowers and 5 white ones.