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 project requires 12 people in group A and 15 people in group B to complete it in 3 days. If 10 people in group C are required to do it, how many days will it take?
有甲、乙、丙三组工人，甲组4人的工作，乙组需要5人完成；乙组3人的工作，丙组需8人完成．一项工程，需甲组12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．
<gadget id="calculator">15 / 4</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">90 / (15/4)</gadget>
<output>24</output>

<result>24</result>