In a test, Liu Tao scored 84 points in the science test, Zhang Liangwei took the test less than Liu Tao (1/7), how many points did Zhang Liangwei test?
在一次测试中，刘涛科学考了84分，张良伟比刘涛少考(1/7)，张良伟考了多少分？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">84 * (6/7)</gadget>
<output>72</output>

<result>72</result>