It takes a machine 12 minutes to fill 200 bottles of soda. At this rate, how many minutes will it take the machine to fill 500 bottles?
It really is quite simple
first you'd have to find the rate of how many bottles of soda (make it Coca Cola) can this machine fill per minute
200/12=16.666.....666 (16 2/3)bottles per minute
now, how long will it takes to fill 500 bottles
500÷16.666666666666=30.0000000000012
round that up, and it took your machine 30 minutes to fill 500 bottles of Coca Cola (and with extra ice)