Answer: 16.
Explanation:
There is 60 minutes in 1 hour, multiply 60 by 4 then divide it by 30. Then multiply by 2.
Answer:
16 birdhouses
2 birdhouses = 30 minutes
multiply by 2
4 birdhouses =60 minutes = 1 hour
Multiply by 4
16 birdhouses = 4 hours
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