The wiring crew needs to erect a communication line. It is planned to erect 105 meters per day and complete in 40 days. How many days can it be completed if an additional 15 meters is erected every day? (Solve with ratio)
架线班要架设一条通讯线路，计划每天架设105米，40天完成．如果每天多架设15米，多少天可以完成？(用比例解)
<gadget id="calculator">105 * 40</gadget>
<output>4_200</output>

<gadget id="calculator">105 + 15</gadget>
<output>120</output>

<gadget id="calculator">4_200 / 120</gadget>
<output>35</output>

<result>35</result>