Lily: 20×40÷2

=800÷2

=400 (square meters)

Rose: 30×40= 1200 (square meter)

Carnation: (20+30+15) × 40-400-1200

=(50+ 15)×40-400- 1200

=65×40-400- 1200

=2600-400- 1200

=2200- 1200

= 1000 (m2)

(2)

(20+30+ 15)×40

=(50+ 15)×40

=65×40

=2600 square meters