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How much cold water at 10 O C must be added to 250 g of hot water at temperature 78 o C to bring the

How much cold water at 10^OC must be added to 250 g of hot water at temperature 78^oC to bring the water temperature of 18^oC?

(c_water= 4186 J/kg^oC)

415 g

975 g

1875 g

2515 g

1500 g

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