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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



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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