Question
At a farm, there were 79 as many ducks and cows. There were 40 more cows than ducks. The farmer sold away some cows. In the end, there were 56  as many ducks as cows. How many cows were sold away?
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At a farm, there were 79 as many ducks and cows. There were 40 more cows than ducks. The farmer sold away some cows. In the end, there were 56  as many ducks as cows. How many cows were sold away?