math
posted by Anonymous .
joel walked 2/5 of a mile to the store. 3/10 of a mile to the library,and 1/20 of a mile to the post office. how far did he walk

If you make everything have the same denominator, then Joel would have walked 8/20 of a mile to the store, 6/20 of a mile to the library, and 1/20 of a mile to the post office. When you add them up, Joel walked 15/20 of a mile or 3/4

You need equivalent fractions with the same denominator.
2/5 = 8/20
3/10 = 6/20
1/20 + 8/20 + 6/20 = ? 
3/10

15/20