After the wheat is ground into flour, its weight is reduced by 50%. How many kilograms of wheat are needed to obtain 3910 kilograms of flour?
小麦磨成面粉后重量减少50%，要得到3910千克面粉，需要多少千克小麦？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3_910 / (1/2)</gadget>
<output>7_820</output>

<result>7_820</result>