When Lin Lin calculated □-40/4, he did the subtraction first, and the result was 50. What is the correct result?
林林在计算□-40/4时，先算了减法，得到的结果是50，它的正确结果是多少？
<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<gadget id="calculator">200 + 40</gadget>
<output>240</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">240 - 10</gadget>
<output>230</output>

<result>230</result>