Basketball player Zhang Qiang has a shooting percentage of 60% in a pitching training session. The number of hits is 4 more than the number of missed shots. How many balls did Zhang Qiang miss in this training?
篮球队员张强在一次投球训练中，命中率是60%，命中的比没命中的多4个球，张强这次训练没命中的有几个球？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5)</gadget>
<output>20</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<result>8</result>