There are two thermally insulated vessels. The first of them contains 5 liters of water at a temperature of t1=60 °C, the second contains 1 liter of water at a temperature of t2=20 °C. First, some of the water was poured from the first vessel into the second. Then, when thermal equilibrium was established in the second vessel, so much water was poured from it into the first vessel so that its volumes in the vessels became equal to the original ones. After these operations, the water temperature in the first vessel became equal to t=59 °C. How much water was poured from the first vessel into the second and back?
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