Two cylinders of refrigerant have the pressure of 50 psig and 110 psig.  A technician decides       the refrigerants are contaminated and wants to combine them in one tank to be sent out.     The tank the mixture will go in is rated for 400 psig.  This tank already has 200 psig in it.  What will be the total pressure when the refrigerants are mixed?        ______________ psig

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