Answer:
4 arrangements
Step-by-step explanation:
The greatest number that both 8 and 12 are divisible by is four. If you were to split them up into four arrangements, each one would have two pink roses (8/4=2) and three white roses (12/4=3) with no leftovers :) so visually it would look like WWWPP WWWPP WWWPP WWWPP
