Choose the correct answer.
Elena has 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 + 7y = 320
y = 7x
B.
x + y = 7
y = 320x
C.
x + y = 320
y = 7x
D.
x – y = 320
y = 7x