Here's an answer:
3 1/4 and
3 1/2
If u need that answer go on google search up math Papa pre algebra calculator.
Answer:
C. Logan
Step-by-step explanation:
you divide the amount of problems by how many minutes it took each person. for example if you divide the amount of problems Logan did by how many minutes it took him. (84÷3) it equals 28.
15, 18, 21
i don't know the other one, sorry