Projects A and B are completed by teams A and B respectively. On a sunny day, Team A needs 12 days to complete Project A, and Team B needs 15 days to complete Project B; on rainy days, Team A’s work efficiency will drop by 40%, and Team B’s work efficiency will drop by 10%. Now, the two teams start construction at the same time and complete the two projects at the same time, so how many days are there sunny days during the construction?
A、B两项工程分别由甲、乙两个队来完成．在晴天，甲队完成A工程需12天，乙队完成B工程需15天；在雨天，甲队的工作效率要下降40%，乙队的工作效率要下降10%．现在，两队同时开工，并同时完成这两项工程，那么在施工的日子里，晴天有多少天．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>