Word problem fractions

Question

Dan walked 3 1/2 miles on Monday, 2 3/4 miles on Tuesday, 2 3/5 miles on Wednesday, and 2 7/8 miles on Thursday. How many miles will dan have to walk on Friday in order to walk 15 miles in five days?

Answer 1

15 - 3 1/2 - 2 3/4 - 2 3/5 - 2 7/8 =

15 - 7/2 - 11/4 - 13/5 - 23/8 =

600/40 - 140/40 - 110/40 - 104/50 - 115/40

(600-140-110-104-115)/40 =

131/40 =

3 11/40