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Two equal amounts of water are mixed by gently pouring both into an insulated cup. One part is initially at 90°C, and the other part is initially at Ti °C. If the final temperature of the mixture is 131°C, what is the value of T ?

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Two equal amounts of water are mixed by gently pouring both into an insulated cup. One part is initially at 90°C, and the other part is initially at T<sup>i </sup>°C. If the final temperature of the mixture is 131°C, what is the value of T ?





 
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