Zhuyuan Village built a water conservancy project, the project was completed in the first week (4/15), and the number of projects completed in the second week was less than that in the first week (1/7). What fraction of the project was completed in the second week?
祝垸村兴修一项水利工程，第一星期完成了工程的(4/15)，第二星期比第一星期少完成工程的(1/7)．第二星期完成了工程的几分之几？
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(4/15) - (1/7)</gadget>
<output>13/105 = around 0.12381</output>

<result>13/105 = around 0.12381</result>