Elena bought 320 tropical fish for a museum display. She bought 7 times as many triggerfish as parrot fish. How many of each typ
e of fish did she buy? A. 20 parrot fish, 140 triggerfish
B. 40 parrot fish. 280 triggerfish
C. 120 parrot fish, 200 triggerfish
D. 280 parrot fish, 40 triggerfish