how u dont know this stuff shhhhh on yo ahh boi
Answer:
9-4/5
5/5 = 1
Step-by-step explanation:
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%