Question

The temperature of equal masses of three different liquids $A,B$ and $C$ are $12$, $19$ and $28$ respectively. The temperature when A and B are mixed is $16$ and when B and C are mixed is $23$. The temperature when A and C are mixed is:

• A. 18.2
• B. 22
• C. 20.2
• D. 24.2

Answer 1

The correct option is C 20.2

The temperature of equal masses of A= $12$, B= $19$ and C= $28$

When A and B are mixed, temperature= $16$ i.e. $\frac{12+19}{2}=\frac{31}{2}=15.5\simeq 16$

Similarly when A and C are mixed, temperature $12+282=\frac{40}{2}=20\simeq 20.2$