Answer:
Plants: 240
Ferns: 60
Step-by-step explanation:
The equation would be .8x-180=.2x
Simplified would be
.6x=180
Divide 180 by .6 you get 300 which is the total. Then you multiply 300 by .8 which gives you 240 and plug that into the equation would be 240-180 giving you 60 ferns which is also 20%