Explanation

We are given:

Total weight of 5 boxes with soup = 75 kg

Weight of each empty box = 3 kg

Step 1: Calculate the total weight of empty boxes

Since there are 5 boxes and each empty box weighs 3 kg:

5 boxes×3 kg=15 kg (total box weight)

Step 2: Subtract the empty box weight from the total weight

75 kg (total)−15 kg (boxes)=60 kg (soup only)