Students in the third grade of No. 2 Primary School participated in the tree planting activity. They dug 15 holes every day. After 16 days, there were still 200 holes left to be dug. How many holes do they need to dig in total?
第二小学三年级学生参加植树活动，每天挖坑15个，16天后还有200个坑没挖，共需要挖多少个坑？
<gadget id="calculator">15 * 16</gadget>
<output>240</output>

<gadget id="calculator">240 + 200</gadget>
<output>440</output>

<result>440</result>