If a coin is tossed 30 times, how many times can the national emblem face up?
抛一枚硬币，抛30次，国徽面朝上的次数可能是多少次
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<result>15</result>