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In a 3-stage air compressor, the inlet pressure is P1, discharge is P4 and the intermediate pressure are P2 and P3 and P3 (P2 < P3). The total pressure of the compressor is 10 and the pressure ratios of the stages are equal. If P1 = 100 kPa, The value of the pressure P3 (in kPa) is     

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