There were 149 angelfish and goldfish in an aquarium. There were twice as many guppies as angelfish. After selling 35 goldfish, there are half as many goldfish as angelfish. How many fish are left in the aquarium?

[x- \ angelfish\ y-\ goldfish\ z-\ guppies\\ \left{\begin{array}{l} x+y=149\2x=z\2(y-35)=x \end{array} \\
2y-70+y=149\ 3y-70=149\ \ |Add\ 70\ 3y=219\ \ |:3\y=73\\ x=149-73\ x=76\ z=2x\ z=2*76=152\\ All\ fishes:\ x+y+z=76+152+73=301\ After\ selling\ 35\ goldfishes\ there\ are\ 266\ fishes\ in\ aquarium. ]

Answered by luana | 2024-06-10

149goldfish and 149angilfish
Guppies Twice as many angilfish
So 149angilfish × 2 ------------- 298guppies
298
+148
--------
447total fish 447
- 35
---------
414 left over

Answered by ethan2 | 2024-06-10

After solving the equations based on the provided information, we find that initially there were 301 fish in the aquarium. After selling 35 goldfish, the total number of fish left in the aquarium is 266.
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Answered by luana | 2024-10-14