Really, everytime I actually need help with a question,

Which number produces a rationale number when multiplied by 1/5

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i