If the weight of wheat ground into flour is reduced by 15%, how many kilograms of wheat are needed to obtain 3910 kilograms of flour?
小麦磨成面粉的重量减少15%，要得到3910千克面粉，需要多少千克小麦？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">3_910 / (17/20)</gadget>
<output>4_600</output>

<result>4_600</result>