Question

Karen is waiting for a pot of soup to cool

off before serving it. After 4 min the
soup has cooled from 100°C to 78°C.
What was the average change in
temperature each minute?

Answer 1

It went down 5.5°C a minute.

Explanation:

You have to look for the difference of 100 and 78, which is 22.

Divide the difference with the minutes (4), equalling 5.5.