The rate of accumulation of salt in the tank is equal to: O the product of the concentration and the volumetric flowrate of the outgoing solutions minus the product of the concentration and the volumetric flowrate of the incoming solutions O the product of the concentration and the volumetric flowrate of the incoming solutions O the product of the concentration and the volumetric flowrate of the incoming solutions minus the product of the concentration and the volumetric flowrate of the outgoing solutions O the product of the concentration and the volumetric flowrate of the incoming solutions plus the product of the concentration and the volumetric flowrate of the outgoing solutions

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