Brain Test Level 134 I had 10 fish in my aquarium, and I came home to see that 6 of them died. How many are left in the aquarium

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By Daze Puzzle /
Question
I had 10 fish in my aquarium, and I came home to see that 6 of them died. How many are left in the aquarium?
Hints
Hint 1:
Dead fish are still in the aquarium.
Step 1
Step 2
Answer
The answer is 10, Because the dead fish are still in the aquarium.