Aaron walked 2 2/3 miles, 1 3/4 miles, 1/3 miles how much did Aaron walk all week? proper number simplified

You are just adding them:

2 2/3 miles, 1 3/4 miles, 1/3 miles
= (8/3 + 7/4 + 1/3) miles
= (32 + 21 + 4)/12 miles
= 57/12 miles
= 19/4 or 4 3/4 or 4.75 miles