2. 4.
Problems to solve on Chain rule:
1. Running at the same constant rate, 3 identical machines can produce a total of 180 bottles per minute. At this rate, how many bottles could 9 such machines produce in 5 minutes?
2. A fort had a provision of food for 100 men for 50 days. After 25 days, 80 men left the fort. The number of days for which the remaining food will last is:

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