There are 200 boxes of beer A and beer B shipped from the store, and beer A accounts for 3/10 of the total, so how much less beer A is than beer B
商店运来甲、乙两种啤酒共200箱，甲种啤酒占总数的(3/10)，则甲种啤酒比乙种啤酒少多少
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">200 * (3/10)</gadget>
<output>60</output>

<gadget id="calculator">200 - 60</gadget>
<output>140</output>

<gadget id="calculator">(3/10) / 140</gadget>
<output>3/1_400 = around 0.002143</output>

<gadget id="calculator">200 * (3/1_400)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>