The average score of A, B, and C in the language test is 85 points. How many points must D get in order to make the average score of the four people reach 87 points.
甲、乙、丙三人语文测验的平均分是85分，丁要考到多少分才能使四人的平均分达到87分．
<gadget id="calculator">87 * 4</gadget>
<output>348</output>

<gadget id="calculator">85 * 3</gadget>
<output>255</output>

<gadget id="calculator">348 - 255</gadget>
<output>93</output>

<result>93</result>