Wang Li's average score in the first two math tests was 87 points, and the average score in the first three math tests was 90 points. How many points did she score in the third math test?
王丽前两次数学测验的平均分是87分，前三次数学测验的平均分是90分，第三次数学测验她考了多少分．
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">87 * 2</gadget>
<output>174</output>

<gadget id="calculator">270 - 174</gadget>
<output>96</output>

<result>96</result>