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Elena bought 320 tropical fish for a museum display. She bought 7 times as many triggerfish as parrotfish. How many of each type of fish did she buy?


Which is a system of equations to model the problem if x represents the number of parrotfish Elena bought and y represents the number of triggerfish she bought?



A.

x + y = 7

y = 320x


B.

x + 7y = 320

y = 7x


C.

x – y = 320

y = 7x


D.

x + y = 320

y = 7x

Verified Answer :

Total number items bought is 
x + y = 320 
because she bought 7x = y i believe the answer is D

the answer is D since the total amount of fish bought was 320 and because she bought 7 times as many tigerfish(y) as parrotfish(x).

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