There are red, yellow and blue balls in a pocket, at least 10 balls of the same color must be drawn out, and at least how many balls must be drawn out.
一个口袋有空红、黄、蓝三种不同颜色的小球，至少要摸出10个相同颜色的小球，至少要摸出多少个．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">27 + 1</gadget>
<output>28</output>

<result>28</result>