Answer:
30 petunias
Step-by-step explanation:
p=petunias
0.25p +12 = 0.15p + 15
-0.15p      -0.15 p         Subtract 0.25 with 0.15
0.10p + 12 = 15
      -12   -12            Subtract 15 with 12
0.10p = 3 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Divide 0.10p with 3
p=30