A quantity of water at 20oC is mixed with another quantity of water at 70oC....

WAEC 2014

A quantity of water at 20^oC is mixed with another quantity of water at 70^oC. The final steady temperature of the mixture is 40^oC. Determine the ratio of the mass of the cold water to that of the hot water

A. 7:2
B. 3:2
C. 2:5
D. 1:2

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Correct Answer: Option B

Explanation

Q = MC\(\theta\)

M = \(\frac{Q}{C\theta}\)

\(\frac{Q}{20C}\) : \(\frac{Q}{30C}\)

= 3:2

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A quantity of water at 20oC is mixed with another quantity of water at 70oC....

Correct Answer: Option B

Explanation

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