Given Data:
Total number of candy Lori brought is: 256
Total number of chocolates is: 78
Total number of melted chocolates is: 49.
The expression to calculate the number of not melted chocolate is,
[tex]\begin{gathered} \text{Total number of chocolate-Total number of melted chocolates=78-49} \\ =29 \end{gathered}[/tex]Thus, there are 29 chocalates which are not melted.