A farmer is selling ducks and chickens at the market. He sells ducks for $10 and chickens for $8. He sells 5 chickens and some ducks. He then spends half his earnings on a new wheelbarrow. After buying it, someone sees it and agrees to pay the farmer double what the farmer paid and the farmer earns another $60. How many ducks did the farmer sell?
The wheelbarrow cost $30 because 60 / 2 = <<60/2=30>>30
The farmer earned $60 from selling fowl because 30 / (1/2) = <<30/(1/2)=60>>60
The farmer earned $40 selling chickens because 5 x 8 = <<5*8=40>>40
The farmer earned $20 selling ducks because 60 - 40 = <<60-40=20>>20
The farmer sold 2 ducks because 20 / 10 = <<20/10=2>>2
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