Answer:-18c
Step-by-step explanation:
usually, if the temperature is above negative it's normal meaning it's warmer. But if the temperature is below 0 and negative then it's colder.
So in this case don't worry about 6c that's not an answer.
Just worry about 15 18 10. These are the ones that could be possible answers.
Now, which number is the greatest?
That would be 18!
18 is your answer!