There are 70 balls in the pocket, of which 20 are red balls, 20 are green balls, 20 are yellow balls, and the rest are white and black balls. Take out as many balls as you want, and you can ensure that there are at least 10 balls of the same color among the balls taken out.
口袋里有70只球，其中20只是红球，20只是绿球，20只是黄球，其余的是白球和黑球．任意从中取出多少只球，可确保取出的球中至少有10只同色的球．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">20 * 3</gadget>
<output>60</output>

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

<gadget id="calculator">27 + 10 + 1</gadget>
<output>38</output>

<result>38</result>