There are three groups of workers, A, B, and C. Group A needs 5 people to complete the work of 4 people in Group A; 8 people in Group C need to complete the work of 3 people in Group B. A job needs to be completed in 3 days with the cooperation of 13 people from group A and 15 people from group B. If 10 people in group C are asked to do it, how many days will it take to complete it?
有甲、乙、丙三组工人，甲组4人的工作，乙组需5人完成；乙组3人的工作，丙组需8人完成．一项工作，需甲组13人、乙组15人合作3天完成．如果让丙组10人去做，需要多少天完成？
<result>25</result>