In the quality inspection and evaluation of a TV factory, 5 points are awarded for each qualified TV produced, and 10 points are deducted for each unqualified TV produced. The first group produces 100 TV sets every day, and a total of 1,850 points are earned within four days. Excuse me: how many qualified TV sets were produced in these four days?
在某电视机厂质量检测评比中，每生产出一台合格电视机记5分，每生产出一台不合格电视机扣10分，第一小组每天生产电视机100台，四天内共得了1850分，请问：这四天一共生产了多少台合格电视机？
<gadget id="calculator">4 * 100</gadget>
<output>400</output>

<gadget id="calculator">4 * 100 * 5</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 - 1_850</gadget>
<output>150</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">150 / 15</gadget>
<output>10</output>

<gadget id="calculator">400 - 10</gadget>
<output>390</output>

<result>390</result>