When 100 g of a liquid A at 100°C is added to 50 g of a liquid B at temperature 75°C, the temperature of the mixture becomes 90°C. The temperature of the mixture, if 100 g of liquid A at 100ºC is added to 50 g of liquid B at 50°℃ will be (a) 60°C (b) 80°C (c) 70°℃ (d) 85°C
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