A aqueous salt-solution enters a crystallizer operating at steady state at 25 C. The feed temperature is 900C and the salt concentration in the feed is 40 weight %. The salt crystallizes as a pentahydrate. The crystals and the mother liquor leave the crystallizer. The molecular weight of the anhydrous salt is 135. The solubility of the salt at 25 C is 20 weight%. The feed flowrate required for a production rate of 100 kg/s of hydrated salt, rounded to the nearest integer, is_____ kg/s.