2/3 of the birds are chickens because 1 -(1/3)=2/3

He has 10 chickens because 15 x (2/3) =<<15*(2/3)=10>>10

It will cost $20 to feed them because 10 x 2=<<10*2=20>>20

# Answer

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Question:
Peter has 15 birds. 1/3 are ducks. The rest are chickens and require special feed that costs $2 per bird. How much does it cost to feed the chickens?
Answer:
Let's think step by step.

user
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Peter has 15 birds. 1/3 are ducks. The rest are chickens and require special feed that costs $2 per bird. How much does it cost to feed the chickens?
train