160 kg of wheat can be ground to produce 136 kg of flour. According to this calculation, how many kilograms of wheat are needed to grind 680 kilograms of flour? (Answer with proportional knowledge)
160千克小麦能磨出136千克面粉．照这样计算，要磨出680千克面粉，需要多少千克小麦？(用比例知识解答)
<gadget id="calculator">136 / 160</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">680 / (17/20)</gadget>
<output>800</output>

<result>800</result>