###Human: Bobby made a big batch of soup weighing 80 kg. Each day the batch gets reduced by half. How many kg will it reach on the fourth day after he made the soup?, ### Assistant: On the first day, the soup reduces down to 80/2=40 kg.
On the second day, it reduces down to 40/2=20 kg.
On the third day, it is reduced to 20/2=10 kg.
And on the fourth day, it is finally down to 10/2=5 kg. 
 So the answer is :  5