Tom finished most of the problems.
Step-by-step explanation:
total number of problems = 30
Tom finished 1/3 of the problems
i.e, he finished = 1/3 X 30 problems
= 10 problems
Steven solved 3/10 of the problems
= 3/10 X 30
=9 problems
Juan finished 20% of the problem.
= 20% of 30
= 20/100 X 30
=6
Marcus completed 8 problems.
so, Tom finished most of the problems i.e, 10 problems.