Medium
1 litre of water at 40 degrees C is mixed with 1 litre of water at 70 degrees C. What will be the temperature of the mixture?
Explanation
Explanation
When equal amounts of water at two different temperatures are mixed, the resulting temperature settles somewhere between the two starting temperatures (here, at their average, 55 degrees C), never higher or lower than either original temperature.
PRO TIP
Re-check your working by substituting the answer back into the original question.