Li Hua's average score in mathematics in the past few times was 88 points. This time, he needs to take 100 points in the test to raise his average score to 91 points. Ask him how many times he took the test this time?
李华前几次的数学平均成绩是88分，这次要考100分，才能把平均成绩提高到91分，问他这次是第几次测试？
<gadget id="calculator">100 - 88</gadget>
<output>12</output>

<gadget id="calculator">91 - 88</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<result>4</result>