A professor packs her collection of 30 issues of a mathematics journal in Boxes numbered A, B, C. She puts 5 issues in Box A, 10 issues in Box B and 15 issues in Box C. In how many ways can she distribute these journals

Each weekday davina rides her bike from her house to school. after school, she rides to the library. then davina takes the same route to get home. these locations are shown on the grid below, where 1 unit on the grid represents 1 kilometer. how many kilometers does she ride each day? 10 16 20 32