Two tanks T and T' are each partially filled with 400 gallons of water. Initially, 250 pounds of salts is dissolved in the solution in tank T and160 pounds of salt is dissolved in the solution in tank T'. The water is circulating from tank T to T' at the rate of 5 gal/min and from tank T' to T at the rate of 6 gal/min. Find the amount of salt in tank T' at t = 20 mins.

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