Multiple choice

Equal masses of three liquids $A, B$ and $C $have temperatures $\displaystyle { 10 }^{ \circ }C,{ 25 }^{ \circ }C$ and $\displaystyle { 40 }^{ \circ }C$ respectively. If A and B are mixed, the mixture has a temperature of $\displaystyle { 15 }^{ \circ }C$. If $B$ and $C$ are mixed, the mixture has a temperature of $\displaystyle { 30 }^{ \circ }C$. If $A$ and $C$ are mixed the temperature of the mixture is:

  1. $\displaystyle { 29 }^{ \circ }C$
  2. $\displaystyle { 25 }^{ \circ }C$
  3. $\displaystyle { 20 }^{ \circ }C$
  4. $\displaystyle { 16 }^{ \circ }C$
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D Correct answer

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