In the 4 exams that have been taken, Zhang Ming's average score is 90 points (the full score of each test is 100 points), in order to make the average score reach 95 points or more as soon as possible, he must take the full score at least as many times as possible.
在已考的4次考试中，张明的平均成绩为90分(每次考试的满分是100分)，为了使平均成绩尽快达到95分以上，他至少还要连考多少次满分．
<gadget id="calculator">100 - 90</gadget>
<output>10</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">10 * (4/5)</gadget>
<output>8</output>

<gadget id="calculator">8 - 4</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>