On a farm, 34 of each acre is planted with blue spruce trees. If there are 16 12 acres of trees on the farm, how many acres are
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Let 
be the amount of salt in the tank at time 
. We're given that 
. The rate at which this amount changes is given by
Since, we get
so that the amount of salt at time is
After 20 minutes, the tank contains
Since
so that the amount of salt at time
After 20 minutes, the tank contains