Running at the same constant rate, 6 identical machines…
To solve this problem, we first want to determine the rate of each machine. Since each machine works at the same constant rate, each machine’s rate is 270/6 = 45 bottles per minute. Now since there are 10 such machines, the rate of the 10 machines together is 10 x 45 = 450 bottles per minute.
Finally, we are asked to determine the number of bottles these 10 machines can produce in 4 minutes. Thus:
rate x time = work
450 x 4 = 1,800 bottles