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When \( 100 \mathrm{~g} \) of a liquid \( \mathrm{A} \) at \( 100^{\circ} \mathrm{C} \) is added to \( 50 \mathrm{~g} \) of a liquid \( \mathrm{B} \) at temperature \( 75^{\circ} \mathrm{C} \), the temperature of
\( \mathrm{P} \)
the mixture becomes \( 90^{\circ} \mathrm{C} \). The temperature of the mixture, if \( 100 \mathrm{~g} \) of liquid \( \mathrm{A} \) at \( 100^{\circ} \mathrm{C} \) is added to \( 50 \mathrm{~g} \) of liquid \( \mathrm{B} \) at \( 50^{\circ} \mathrm{C} \), will be:
(1) \( 85^{\circ} \mathrm{C} \)
(2) \( 60^{\circ} \mathrm{C} \)
(3) \( 80^{\circ} \mathrm{C} \)
(4) \( 70^{\circ} \mathrm{C} \)


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