Annie needs to solve 855 divided by 19 she thought she would solve 855 divided by 20 and then adjust since 20 is an easier number to work with than 19. can she solve the problem this way? why or why not? show your work

The distance between mike’s house and the grocery store is 4/5 of a mile. mike has walked 1/2 of a mile from his house to the grocery store. how much farther does he needs to walk to reach the grocery store? a. 13/10 miles b. 3/4 of a mile c. 3/10 of a mile d. 2/5 of a mile