Class 6 (1) has 36 students. In the first physical education standard test, the ratio of the number of people who reached the standard to the number of people who failed to reach the standard was 1:5. Later, through the efforts of the students, in the second test, the ratio of the students who failed to meet the standard was 1:5. Once it is reduced by half, how many people are up to the standard at this time?
六(一)班有36人，第一次体育达标测试中，达标人数与未达标人数的比是1：5，后来经同学们的努力，到第二次测试时，未达标的同学比第一次减少了一半，此时达标人数有多少人．
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<gadget id="calculator">36 - 15</gadget>
<output>21</output>

<result>21</result>