The largest number of the group she can make is:
6
It is given that:
Emma has 18 yellow flowers and 30 white flowers.
The largest number of groups she can make is the G.C.D.(greatest common divisor) of the two numbers.
we know that:
G.C.D.(18,30)=6
( since 18=2×3×3
and 30=2×3×5
Hence, G.C.D(18,30)=2×3=6 )
This means that there are 6 groups such that each group has: 3 yellow flowers and 5 white flowers.