If you put 7 red pencils and 3 blue pencils in a pocket, and each time you draw 1 pencil from the pocket, what is the probability of drawing a red pencil?
把7支红色铅笔和3支同样的蓝色铅笔放在一个口袋里，每次从袋里摸出1支铅笔，摸出红色铅笔的可能性是多少
<gadget id="calculator">7 + 3</gadget>
<output>10</output>

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

<result>7/10 = around 0.7</result>