6. What is the total number of calories lost when 10

grams of water at 80°C is cooled to 60°C?

A) 10 B) 20 C) 100 D) 200

B

Explanation:

so you started out with 80

you have to cool it till 60

so it is decreasing which means you have to subtract

Note=if something is increasing or wanting to go up its addition but for this problem 60 is less then 80 so we are doing subtraction

80-60=20