The 7th grade team picked more pumpkins per minute.
Step-by-step explanation:
If you take 16 pumpkins and divide it by the 4 minutes, so you can get the one to one ratio you would get 4 pumpkins per minute for the 6th grade team. Now we do the same thing with the seventh grade team and 48 divided by 8 is 6 pumpkins per minute. So 6 pumpkins per minute is larger than 4 pumpkins per minute. That means the 7th grade picked the pumpkins the fastest.
21 students because if 6 represents 30% u add 6 two more time which equals 18 and 90% then u add 3 more because it is half of 6. when u add 3 more u will get 21 and 100%