A mass of a liquid at 30^oC is mixed with a mass of the same liquid at 70^oC and the temperature of the mixture is 45^oC. Find the ratio of the mass of the cold liquid to the mass of the other liquid.

3 : 5

5 : 3

3 : 7

7 : 3

Correct answer is B

Heat lost = heat gained

m_H x c x (70 - 45) = m_c x c x (45 - 30)

\(\frac{m_c}{m_H}\) = \(\frac{5}{3}\)

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A mass of a liquid at 30oC is mixed with a mass of the same liquid at 70oC and the temperature of the mixture is 45oC. Find the ratio of the mass of the cold liquid to the mass of the other liquid.