Will's breakfast supplied him 900 calories of energy. Then he decided to jog for half an hour, which used up 10 calories of energy per minute. What is Will's net calorie intake after jogging? Think carefully first, then make a decision:
Will jogged for 60 / 2 = 30 minutes. He was able to use up 10 x 30 = 300 calories for jogging. The net calorie intake of Will after jogging is 900 - 300 = 600. So, the answer is 600.