The cafeteria purchased 60 kilograms of cabbage and radishes in total, of which the weight ratio of cabbage to radishes was 7:3, and then purchased several kilograms of radishes. At this time, the number of kilograms of radishes accounted for the total (2/5), and then purchased radishes How many kilograms.
食堂购进白菜和萝卜共60千克，其中白菜与萝卜的重量比为7：3，后又购进了若干千克萝卜，这时萝卜千克数占总数的(2/5)，则又购进萝卜多少千克．
<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/10) / (3/5)</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">60 * (7/6)</gadget>
<output>70</output>

<gadget id="calculator">70 - 60</gadget>
<output>10</output>

<result>10</result>