Correct Answer: Option C

Explanation

Heat lost = heat gained

200 x c x (90 - \(\theta\))= 100\(\times\) c \(\times\) (\(\theta - 30\))

Dividing through by 100c, we have

2(\(90 - \theta\)) = (\(\theta - 30\))

simplifying, we have

\(\theta\) = 70°

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