The temperature of equal masses of three...

The temperature of equal masses of three different liquids A,B and C are `12^@C, 19^@C and 28^@C` respectively. The temperature when A and B are mixed is `16^@C` and when B and C are mixed it is `23^@C`. What should be the temperature when A and C are mixed?

`15^@C`

`18.2 ^@C`

`20.25^@C`

`24.5 ^@C`

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