Matthew is on the swim team every week he swims 20 miles if he practices 4 days each week and swims the same number of miles each practice how many miles does he swim each day?

This problem is one of division, and the setup is simple. All you would need to do is divide the number of miles Matthew swims by the number of days he practices.

20/4 = 5

Matthew swims 5 miles every day

If Mathew swims an equal many miles for 4 days a week then to find out how many miles he swam each of those four days then you would divide. 20/4 which would give you your answer 5 miles
Hope this helps! :)