My mother knits a sweater according to the weight ratio of black and white wool 4:3. The black wool used 0.8 kg, and how many kilograms of white wool was used.
妈妈按黑白毛线的重量比4：3的比例搭配起来编织毛衣，黑毛线用了0.8千克，白毛线用了多少千克．
<gadget id="calculator">0.8 / 4</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 * 3</gadget>
<output>0.6</output>

<result>0.6</result>